rev |
line source |
pascal@12556
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1 --- linux-3.2.14/arch/x86/boot/header.S
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pascal@12556
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2 +++ linux-3.2.14/arch/x86/boot/header.S
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pascal@15203
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3 @@ -7,12 +7,14 @@
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slaxemulator@8085
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4 * modified by more people than can be counted
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slaxemulator@8085
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5 *
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pascal@12556
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6 * Rewritten as a common file by H. Peter Anvin (Apr 2007)
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pascal@16547
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7 + * Rewritten by Pascal Bellard (Nov 2009)
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slaxemulator@8085
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8 *
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slaxemulator@8085
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9 * BIG FAT NOTE: We're in real mode using 64k segments. Therefore segment
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slaxemulator@8085
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10 * addresses must be multiplied by 16 to obtain their respective linear
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pascal@15203
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11 * addresses. To avoid confusion, linear addresses are written using leading
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pascal@15203
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12 * hex while segment addresses are written as segment:offset.
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pascal@15203
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13 *
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pascal@15203
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14 + * Assume protocol 2.00+ (kernel >= 1.3.73)
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pascal@15203
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15 */
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pascal@15203
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16
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pascal@15203
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17 #include <asm/segment.h>
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pascal@15203
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18 @@ -27,6 +29,8 @@
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slaxemulator@8085
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19
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slaxemulator@8085
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20 BOOTSEG = 0x07C0 /* original address of boot-sector */
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slaxemulator@8085
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21 SYSSEG = 0x1000 /* historical load address >> 4 */
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slaxemulator@8085
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22 +INITSEG = 0x9000 /* boot address >> 4 */
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slaxemulator@8085
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23 +SETUPSEG = 0x9020 /* setup address >> 4 */
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slaxemulator@8085
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24
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slaxemulator@8085
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25 #ifndef SVGA_MODE
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slaxemulator@8085
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26 #define SVGA_MODE ASK_VGA
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pascal@16547
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27 @@ -40,53 +44,505 @@
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pascal@15203
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28 #define ROOT_RDONLY 1
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slaxemulator@8085
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29 #endif
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pascal@15203
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30
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pascal@15203
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31 +setup_sects = 497
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pascal@15203
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32 +syssize = 500
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pascal@15203
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33 +cmd_line_ptr = 0x228
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pascal@15203
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34 +
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pascal@15203
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35 +/* some extra features */
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pascal@16547
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36 +#define EXE_SUPPORT real mode dos .exe file support
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pascal@15203
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37 +#define CMDLINE kernel >= 2.4
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pascal@15203
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38 +#define OLDCMDLINE kernel < 2.4
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pascal@15203
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39 +#define HELP display version for ? argument
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pascal@15203
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40 +#define MORETHAN16M up to 4Gb RAM, not 16Mb
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pascal@15203
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41 +#define KEYBOARDLESS_SUPPORT scan floppy swap each 5 seconds
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pascal@15203
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42 +
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pascal@16547
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43 +/* some limitations to reduce the code size */
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pascal@16547
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44 +#define FLOPPY_1440K_ONLY 1.44M floppies support only (no 1.72M, 1.96M...)
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pascal@15203
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45 +
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pascal@15203
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46 .code16
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pascal@15203
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47 .section ".bstext", "ax"
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slaxemulator@8085
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48
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slaxemulator@8085
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49 .global bootsect_start
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slaxemulator@8085
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50 bootsect_start:
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pascal@15203
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51
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pascal@15203
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52 - # Normalize the start address
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pascal@15203
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53 - ljmp $BOOTSEG, $start2
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pascal@15203
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54 +#ifdef EXE_SUPPORT
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pascal@15203
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55 +#define CODESZ 0x8000
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pascal@15203
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56 +#define EXEADRS(x) x+0xE0
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pascal@15203
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57 +stacktop = 0x9E00 # in 0x8000 .. 0xA000
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pascal@15203
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58 + decw %bp // Magic number: MZ
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pascal@15203
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59 + popw %dx
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pascal@15273
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60 + jmp fdstart // Bytes on last page of file
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pascal@15203
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61 + .word (CODESZ+511)/512 // Pages in file
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pascal@15203
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62 + .word 0 // Relocations
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pascal@15203
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63 + .word 2 // Size of header in paragraphs
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pascal@15203
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64 + .word 4096 // Minimum extra paragraphs needed
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pascal@15203
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65 + .word -1 // Maximum extra paragraphs needed
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pascal@15203
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66 + .word (CODESZ+15)/16 // Initial (relative) SS value
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pascal@15203
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67 + .word stacktop // Initial SP value
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pascal@15203
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68 + .word 0 // Checksum
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pascal@15203
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69 + .word EXEADRS(comstart) // Initial IP value
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pascal@15203
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70 + .word 0xFFF0 // Initial (relative) CS value
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pascal@15203
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71 +// .word 0x001C // File address of relocation table
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pascal@15203
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72 +// .word 0,0,0 // Overlay number
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pascal@15203
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73 +swap_floppy:
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pascal@15203
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74 + .ascii "Next!"
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pascal@15203
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75 + .byte 7,13,0 # swap detection needs 13, 0
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pascal@15203
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76 +#ifdef OLDCMDLINE
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pascal@15203
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77 + .word 0xA33F
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pascal@15203
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78 + .word stacktop
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pascal@15203
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79 +#endif
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pascal@15273
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80 +fdstart:
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pascal@15203
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81 + pushw %dx
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pascal@15203
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82 +#endif
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pascal@15203
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83
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pascal@15203
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84 -start2:
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pascal@15203
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85 - movw %cs, %ax
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pascal@15203
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86 - movw %ax, %ds
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pascal@15203
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87 - movw %ax, %es
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pascal@15203
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88 - movw %ax, %ss
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pascal@15203
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89 - xorw %sp, %sp
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pascal@15203
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90 - sti
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pascal@15203
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91 - cld
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pascal@16547
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92 +LOADSEG = 0x8000 # 0x1000 multiple, up to 512K zImage
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pascal@16547
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93 +LOADSZ = 0x10000
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pascal@16547
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94 +#ifdef EXE_SUPPORT
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pascal@16547
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95 +#A20BUFFER = 0x60000 # a20 gate / himem.sys support
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pascal@16547
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96 +A20BUFFER = 0x68000 # a20 gate / himem.sys support
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pascal@16547
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97 +#define USEA20BUFFER
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pascal@15203
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98 +#endif
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pascal@15203
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99
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pascal@15203
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100 - movw $bugger_off_msg, %si
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pascal@16547
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101 +# bootsect_start:
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slaxemulator@8085
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102 + cld # assume nothing
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slaxemulator@8085
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103 +stacktop = 0x9E00 # in 0x8000 .. 0xA000
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pascal@12556
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104 +zeroed = 48+12 # gdt + zeroed registers
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slaxemulator@8085
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105 + movw $stacktop-12-zeroed, %di # stacktop is an arbitrary value >=
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slaxemulator@8085
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106 + # length of bootsect + length of
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slaxemulator@8085
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107 + # setup + room for stack;
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slaxemulator@8085
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108 + # 12 is disk parm size.
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slaxemulator@8085
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109 + pushw $INITSEG
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pascal@12556
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110 + popw %ss # %ss contain INITSEG
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slaxemulator@8085
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111 + movw %di, %sp # put stack at INITSEG:stacktop-...
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pascal@16547
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112
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pascal@16547
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113 -msg_loop:
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pascal@16547
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114 - lodsb
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pascal@16547
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115 - andb %al, %al
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pascal@16547
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116 - jz bs_die
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pascal@16547
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117 - movb $0xe, %ah
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pascal@16547
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118 - movw $7, %bx
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pascal@16547
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119 - int $0x10
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pascal@16547
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120 - jmp msg_loop
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slaxemulator@8085
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121 +# Many BIOS's default disk parameter tables will not recognize
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slaxemulator@8085
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122 +# multi-sector reads beyond the maximum sector number specified
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slaxemulator@8085
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123 +# in the default diskette parameter tables - this may mean 7
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slaxemulator@8085
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124 +# sectors in some cases.
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slaxemulator@8085
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125 +#
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slaxemulator@8085
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126 +# Since single sector reads are slow and out of the question,
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slaxemulator@8085
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127 +# we must take care of this by creating new parameter tables
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slaxemulator@8085
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128 +# (for the first disk) in RAM. We can set the maximum sector
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slaxemulator@8085
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129 +# count to 36 - the most we will encounter on an ED 2.88.
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slaxemulator@8085
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130 +#
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slaxemulator@8085
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131 +# High doesn't hurt. Low does. Let's use the max: 63
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pascal@16547
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132
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pascal@16547
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133 -bs_die:
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pascal@16547
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134 - # Allow the user to press a key, then reboot
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pascal@16547
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135 - xorw %ax, %ax
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pascal@12556
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136 + pushw %ss
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pascal@12556
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137 + popw %es # %es = %ss = INITSEG
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slaxemulator@8085
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138 + xorw %ax, %ax # %ax = 0
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pascal@15203
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139 +#ifdef EXE_SUPPORT
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pascal@15203
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140 + cwd # floppy = head = 0
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pascal@15203
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141 +#endif
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slaxemulator@8085
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142 + movw $zeroed/2, %cx # clear gdt + offset, %ds, limits
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slaxemulator@8085
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143 + rep # don't worry about cld
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slaxemulator@8085
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144 + stosw # already done above
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slaxemulator@8085
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145 + popw %bx # offset = 0
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slaxemulator@8085
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146 + popw %ds # %ds = 0
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pascal@12556
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147 + popw %fs # %fs = 0
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pascal@15203
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148 +
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slaxemulator@8085
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149 + movb setup_sects+0x7C00, %al # read bootsector + setup (%ds = 0)
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slaxemulator@8085
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150 + incw %ax
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pascal@15203
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151 +
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pascal@12556
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152 + ldsw 0x78(%bx), %si # %ds:%bx+0x78 is parameter table address
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slaxemulator@8085
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153 + pushw %es
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pascal@12556
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154 + pushw %di
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slaxemulator@8085
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155 + movb $6, %cl # copy 12 bytes
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slaxemulator@8085
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156 + rep # don't worry about cld
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slaxemulator@8085
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157 + movsw # already done above
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pascal@12556
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158 + pushw %ss
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slaxemulator@8085
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159 + popw %ds # now %ds = %es = %ss = INITSEG
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pascal@12556
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160 + popl %fs:0x78(%bx) # update parameter table address
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slaxemulator@8085
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161 + movb $63, 0x4-12(%di) # patch sector count, %di = stacktop
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slaxemulator@8085
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162 + cli
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slaxemulator@8085
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163 +
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slaxemulator@8085
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164 + xchg %ax, %di # sector count
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slaxemulator@8085
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165 + popw %ax # limits = 0
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pascal@12556
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166 + incw %cx # cylinder 0, sector 1, clear Z
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slaxemulator@8085
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167 + call read_first_sectors # read setup
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pascal@15203
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168 +loadsys:
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slaxemulator@8085
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169 + movw $0x200,%si
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pascal@12556
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170 +type_of_loader = 0x10
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pascal@12556
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171 +loadflags = 0x11
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pascal@12556
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172 +heap_end_ptr = 0x24
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pascal@12556
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173 + orw $0x8020, type_of_loader(%si) # loader type = 0x20 = bootsect-loader
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pascal@12556
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174 + movb $(stacktop-0x300)/256, heap_end_ptr+1(%si)
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pascal@15203
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175 + call puts_version # show which kernel we are loading
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slaxemulator@8085
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176 +
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pascal@12556
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177 +# This routine loads the system at address LOADSEG, making sure
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slaxemulator@8085
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178 +# no 64kB boundaries are crossed. We try to load it as fast as
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slaxemulator@8085
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179 +# possible, loading whole tracks whenever we can.
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pascal@15203
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180 +
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slaxemulator@8085
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181 +ramdisk_image = 0x0218
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slaxemulator@8085
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182 +ramdisk_size = 0x021C
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pascal@12556
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183 +bootsect_src_limit = 16
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pascal@12556
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184 +bootsect_dst_limit = 24
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pascal@12556
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185 +bootsect_src_base = 18
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pascal@15203
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186 +bootsect_dst_base = 26 # bits 0..23
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pascal@15203
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187 +bootsect_dst_base_hi = 31 # bits 24..31
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pascal@12556
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188 + popw %bx # clear %bx
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slaxemulator@8085
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189 + movw %sp, %si # for bootsect_gdt
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pascal@12556
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190 +init_gdt:
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pascal@12556
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191 + decw bootsect_src_limit(%bx,%si) # max 64Kb
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pascal@15203
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192 + movw $0x9300+(LOADSEG/0x1000), bootsect_src_base+2(%bx,%si)
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pascal@12556
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193 + xorb $bootsect_dst_limit-bootsect_src_limit, %bl
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pascal@12556
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194 + jne init_gdt
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pascal@12556
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195 +code32_start = 0x214
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pascal@12556
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196 + movw code32_start+1, %ax # destination = 0x00100000 or 0x00010000
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pascal@15203
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197 + movl syssize, %ebx
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pascal@12556
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198 + decl %ebx
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pascal@15203
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199 + shrl $5, %ebx
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pascal@16547
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200 +#ifdef MORETHAN16M
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pascal@15203
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201 + incl %ebx
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pascal@16547
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202 +#else
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pascal@16547
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203 + incw %bx
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pascal@16547
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204 +#endif
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pascal@16547
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205 +#ifdef USEA20BUFFER
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pascal@16547
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206 + movw $0x00100000>>8, %di
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pascal@16547
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207 +#endif
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slaxemulator@8085
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208 +syslp:
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pascal@16547
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209 +#ifdef USEA20BUFFER
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pascal@16547
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210 + cmpw %ax, %di
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pascal@16547
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211 + jne nota20
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pascal@16547
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212 + xorw $(0x00100000+A20BUFFER)>>8, %ax
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pascal@16547
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213 +nota20:
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pascal@16547
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214 +#endif
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pascal@12556
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215 + movw %ax, bootsect_dst_base+1(%si)
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pascal@16547
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216 +#ifdef MORETHAN16M
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pascal@16547
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217 + movl $LOADSZ/512, %edi # size in sectors
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pascal@16547
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218 + subl %edi, %ebx
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pascal@16547
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219 +#else
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pascal@15203
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220 + movw $LOADSZ/512, %di # size in sectors
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pascal@16547
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221 + subw %di, %bx
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pascal@16547
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222 +#endif
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slaxemulator@8085
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223 + pushf
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slaxemulator@8085
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224 + jnc not_last
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pascal@12556
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225 + addw %bx, %di
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slaxemulator@8085
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226 +not_last:
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slaxemulator@8085
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227 + pushw %ax
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slaxemulator@8085
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228 + pushw %si
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pascal@12556
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229 + pushw %bx
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pascal@12556
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230 + xorw %bx,%bx
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pascal@15203
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231 + pushw $LOADSEG
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pascal@15203
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232 + popw %es
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pascal@15203
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233 +patchcall:
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pascal@12556
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234 + call read_sectors # update %bp
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pascal@12556
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235 + popw %bx
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slaxemulator@8085
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236 + popw %si
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pascal@15203
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237 + movw $LOADSZ/2, %cx # word count
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slaxemulator@8085
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238 + movb $0x87, %ah
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pascal@12556
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239 + pushw %ss
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pascal@12556
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240 + popw %es # restore es
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pascal@15203
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241 + int $0x15 # max 16M, maybe more...
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slaxemulator@8085
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242 + popw %ax
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pascal@16547
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243 + incb %ah # next dest (ax+=LOADSZ/256)
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pascal@15203
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244 +#ifdef MORETHAN16M
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pascal@15203
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245 + adcb %cl, bootsect_dst_base_hi(%si) # breaks 16M limit ?
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pascal@15203
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246 +#endif
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pascal@16547
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247 +#ifdef USEA20BUFFER
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pascal@16547
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248 + movw $(LOADSZ+A20BUFFER)>>8, %di
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pascal@16547
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249 +#endif
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slaxemulator@8085
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250 + popf
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slaxemulator@8085
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251 + ja syslp
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pascal@16547
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252 +#ifdef USEA20BUFFER
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pascal@16547
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253 +#ifdef MORETHAN16M
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pascal@16547
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254 + movb %cl, bootsect_dst_base_hi(%si)
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pascal@16547
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255 +#endif
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pascal@16547
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256 + movb $0x10, bootsect_dst_base+2(%si)
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pascal@16547
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257 + movw $A20BUFFER/0x100, bootsect_src_base+1(%si)
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pascal@16547
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258 + movb $0x87, %ah
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pascal@16547
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259 + int $0x15
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pascal@16547
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260 +#endif
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pascal@16547
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261 +
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slaxemulator@8085
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262 +# This procedure turns off the floppy drive motor, so
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slaxemulator@8085
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263 +# that we enter the kernel in a known state, and
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slaxemulator@8085
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264 +# don't have to worry about it later.
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pascal@15203
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265 +
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pascal@12556
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266 +kill_motor:
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pascal@12556
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267 + xchgw %ax, %di # reset FDC (%di < 128)
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pascal@12556
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268 + int $0x13
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slaxemulator@8085
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269 +
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slaxemulator@8085
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270 +# After that (everything loaded), we jump to the setup-routine
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slaxemulator@8085
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271 +# loaded directly after the bootblock:
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slaxemulator@8085
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272 +# Segments are as follows: %ds = %ss = INITSEG
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slaxemulator@8085
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273 +
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slaxemulator@8085
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274 + ljmp $SETUPSEG, $0
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slaxemulator@8085
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275 +
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slaxemulator@8085
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276 +# read_sectors reads %di sectors into %es:0 buffer.
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slaxemulator@8085
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277 +# %es:0 is updated to the next memory location.
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slaxemulator@8085
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278 +# First, sectors are read sector by sector until
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slaxemulator@8085
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279 +# sector per track count is known. Then they are
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slaxemulator@8085
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280 +# read track by track.
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slaxemulator@8085
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281 +# Assume no error on first track.
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slaxemulator@8085
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282 +
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slaxemulator@8085
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283 +#define FLOPPY_CYLINDERS 80 /* 80 cylinders minimum */
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slaxemulator@8085
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284 +#define FLOPPY_HEADS 2 /* 2 heads minimum */
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slaxemulator@8085
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285 +#define FLOPPY_SECTORS 18 /* 18 sectors minimum */
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slaxemulator@8085
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286 +
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slaxemulator@8085
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287 +check_limits:
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pascal@15203
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288 +#ifndef FLOPPY_1440K_ONLY
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pascal@15203
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289 + popw %dx
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slaxemulator@8085
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290 + cmpb $FLOPPY_SECTORS+1, %cl # 18 sectors minimum
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slaxemulator@8085
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291 + jb check_head
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slaxemulator@8085
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292 + cmpb %al, %cl # max sector known ?
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slaxemulator@8085
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293 + ja next_head # no -> store it
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slaxemulator@8085
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294 +check_head:
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slaxemulator@8085
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295 + cmpb $FLOPPY_HEADS, %dh # 2 heads minimum
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slaxemulator@8085
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296 + jb check_cylinder
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slaxemulator@8085
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297 + cmpb %ah, %dh # max head known ?
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slaxemulator@8085
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298 + ja next_cylinder # no -> store it
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slaxemulator@8085
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299 +check_cylinder:
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pascal@15203
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300 +#endif
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slaxemulator@8085
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301 + pushaw
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pascal@15203
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302 +#ifndef FLOPPY_1440K_ONLY
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slaxemulator@8085
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303 + cbw # %ah = 0
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pascal@15203
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304 +#endif
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slaxemulator@8085
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305 + int $0x13 # reset controler
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pascal@15203
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306 + stc
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pascal@15203
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307 + call putcdot # print '-'
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pascal@15203
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308 +read_sectorslp:
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slaxemulator@8085
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309 + popaw
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pascal@15203
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310 +bdendlp:
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slaxemulator@8085
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311 + pushw %dx # some bios break dx...
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pascal@15203
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312 +#ifndef FLOPPY_1440K_ONLY
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slaxemulator@8085
|
313 + pushw %ax # limits
|
slaxemulator@8085
|
314 + subb %cl, %al # sectors remaining in track
|
slaxemulator@8085
|
315 + ja tolastsect
|
slaxemulator@8085
|
316 + movb $1, %al # 1 sector mini
|
slaxemulator@8085
|
317 +tolastsect:
|
pascal@15203
|
318 +#else
|
pascal@15203
|
319 + mov $FLOPPY_SECTORS+1, %al
|
pascal@15203
|
320 + subb %cl, %al # sectors remaining in track
|
pascal@15203
|
321 +#endif
|
slaxemulator@8085
|
322 + cbw
|
slaxemulator@8085
|
323 + cmpw %di, %ax
|
slaxemulator@8085
|
324 + jb more1trk
|
slaxemulator@8085
|
325 + movw %di, %ax # sectors to read
|
slaxemulator@8085
|
326 +more1trk:
|
slaxemulator@8085
|
327 + pushw %ax # save context
|
slaxemulator@8085
|
328 + movb $2, %ah # cmd: read chs
|
slaxemulator@8085
|
329 + int $0x13
|
pascal@15203
|
330 +#ifndef FLOPPY_1440K_ONLY
|
pascal@15203
|
331 + popw %dx # save %ax
|
slaxemulator@8085
|
332 + popw %ax # limits
|
pascal@15203
|
333 +#else
|
pascal@15203
|
334 + popw %ax # restore context
|
slaxemulator@8085
|
335 + popw %dx
|
pascal@15203
|
336 +#endif
|
slaxemulator@8085
|
337 + jc check_limits
|
pascal@15203
|
338 +#ifndef FLOPPY_1440K_ONLY
|
slaxemulator@8085
|
339 + xchgw %ax, %bp
|
pascal@15203
|
340 + addw %dx,%cx # next sector
|
pascal@12556
|
341 + movw %cx, %gs
|
pascal@15203
|
342 + addb %dl,%bh
|
pascal@15203
|
343 + addb %dl,%bh # next location
|
pascal@15203
|
344 + subw %dx,%di # update sector counter
|
pascal@15203
|
345 + popw %dx
|
slaxemulator@8085
|
346 + jz putcdot
|
pascal@15203
|
347 +#else
|
pascal@15203
|
348 + addw %ax,%cx # next sector
|
pascal@15203
|
349 + movw %cx, %gs
|
pascal@15203
|
350 + addb %al,%bh
|
pascal@15203
|
351 + addb %al,%bh # next location
|
pascal@15203
|
352 + subw %ax,%di # update sector counter
|
pascal@15203
|
353 + jz putcdot
|
pascal@15203
|
354 +#endif
|
slaxemulator@8085
|
355 +read_sectors:
|
pascal@12556
|
356 + movw %gs, %cx
|
pascal@15203
|
357 +#ifndef FLOPPY_1440K_ONLY
|
pascal@12556
|
358 +# al is last sector+1
|
pascal@12556
|
359 +# ah is last cylinder+1
|
slaxemulator@8085
|
360 + xchgw %ax, %bp
|
pascal@15203
|
361 +#endif
|
pascal@15203
|
362 +#ifndef FLOPPY_1440K_ONLY
|
slaxemulator@8085
|
363 + cmpb %al,%cl # reach sector limit ?
|
slaxemulator@8085
|
364 + jne bdendlp
|
slaxemulator@8085
|
365 +next_head:
|
slaxemulator@8085
|
366 + movb %cl,%al
|
pascal@15203
|
367 +#else
|
pascal@15203
|
368 + cmpb $FLOPPY_SECTORS+1,%cl # reach sector limit ?
|
pascal@15203
|
369 + jne bdendlp
|
pascal@15203
|
370 +#endif
|
slaxemulator@8085
|
371 + incb %dh # next head
|
slaxemulator@8085
|
372 + movb $1,%cl # first sector
|
pascal@15203
|
373 +#ifndef FLOPPY_1440K_ONLY
|
slaxemulator@8085
|
374 + cmpb %ah, %dh # reach head limit ?
|
slaxemulator@8085
|
375 + jne bdendlp
|
slaxemulator@8085
|
376 +next_cylinder:
|
slaxemulator@8085
|
377 + movb %dh,%ah
|
pascal@15203
|
378 +#else
|
pascal@15203
|
379 + cmpb %cl,%dh # reach head limit ?
|
pascal@15203
|
380 + je bdendlp
|
pascal@15203
|
381 +#endif
|
slaxemulator@8085
|
382 +# NOTE : support 256 cylinders max
|
slaxemulator@8085
|
383 + incb %ch # next cylinder
|
slaxemulator@8085
|
384 +read_first_sectors:
|
pascal@15203
|
385 + cmpb $FLOPPY_CYLINDERS,%ch # reach cylinder limit ?
|
slaxemulator@8085
|
386 + movb $0,%dh # first head
|
pascal@12556
|
387 + jne bdendlp
|
slaxemulator@8085
|
388 +next_floppy:
|
slaxemulator@8085
|
389 + movb $0,%ch # first cylinder
|
slaxemulator@8085
|
390 + pushaw
|
slaxemulator@8085
|
391 + movw $swap_floppy,%si
|
pascal@15203
|
392 +#ifdef KEYBOARDLESS_SUPPORT
|
slaxemulator@8085
|
393 + pushw %bx
|
pascal@12556
|
394 + call puts
|
slaxemulator@8085
|
395 + popw %bx
|
slaxemulator@8085
|
396 +waitfloppy:
|
slaxemulator@8085
|
397 + call wait
|
slaxemulator@8085
|
398 + jne waitfloppydone
|
slaxemulator@8085
|
399 + pushw %dx # some bios break dx...
|
slaxemulator@8085
|
400 + cbw
|
slaxemulator@8085
|
401 + int $0x13 # reset FDC
|
slaxemulator@8085
|
402 + movw $0x201,%ax
|
slaxemulator@8085
|
403 + int $0x13 # read first sector
|
slaxemulator@8085
|
404 + popw %dx
|
slaxemulator@8085
|
405 + rclb $1,%ah # floppy changed 06=>0D no error 00
|
slaxemulator@8085
|
406 + cmpb -2(%si), %ah # 0D then 00
|
slaxemulator@8085
|
407 + jne waitfloppy # no => try again
|
slaxemulator@8085
|
408 + incw %si
|
pascal@15203
|
409 + decw %ax # was 0001 ?
|
slaxemulator@8085
|
410 + jne waitfloppy
|
slaxemulator@8085
|
411 +waitfloppydone:
|
pascal@15203
|
412 +#else
|
pascal@15203
|
413 + call puts
|
pascal@15203
|
414 + cbw # %ah = 0, get keyboard character
|
pascal@15203
|
415 int $0x16
|
pascal@15203
|
416 - int $0x19
|
pascal@15203
|
417 +#endif
|
slaxemulator@8085
|
418 + jmp read_sectorslp
|
pascal@16547
|
419
|
pascal@16547
|
420 - # int 0x19 should never return. In case it does anyway,
|
pascal@16547
|
421 - # invoke the BIOS reset code...
|
pascal@16547
|
422 - ljmp $0xf000,$0xfff0
|
pascal@15203
|
423 +#ifdef EXE_SUPPORT
|
pascal@15203
|
424 +read_sectors_dos:
|
pascal@16547
|
425 + xorw %dx, %dx // write to %ds:%dx, not %es:%bx
|
pascal@16547
|
426 + call read_sectors_dosz
|
pascal@16547
|
427 +read_sectors_dosz:
|
pascal@15203
|
428 + pushw %es
|
pascal@15203
|
429 + popw %ds
|
pascal@15203
|
430 + movb $0x3F, %ah // read
|
pascal@15203
|
431 + movw %di, %cx
|
pascal@16547
|
432 + shlw $8, %cx // byte count / 2
|
pascal@15203
|
433 + movw %bp, %bx
|
pascal@15203
|
434 + int $0x21
|
pascal@16547
|
435 + xchgw %ax, %dx
|
pascal@15203
|
436 + pushw %ss
|
pascal@15203
|
437 + popw %ds
|
pascal@15203
|
438 +#endif
|
pascal@15203
|
439
|
pascal@15203
|
440 - .section ".bsdata", "a"
|
pascal@15203
|
441 -bugger_off_msg:
|
pascal@15203
|
442 - .ascii "Direct booting from floppy is no longer supported.\r\n"
|
pascal@15203
|
443 - .ascii "Please use a boot loader program instead.\r\n"
|
pascal@15203
|
444 - .ascii "\n"
|
pascal@15203
|
445 - .ascii "Remove disk and press any key to reboot . . .\r\n"
|
pascal@15203
|
446 - .byte 0
|
slaxemulator@8085
|
447 +putcdot:
|
pascal@15203
|
448 + movb $'.'+3, %al // . = success, - = failure
|
slaxemulator@8085
|
449 +putclf:
|
pascal@15203
|
450 + sbbb $3, %al
|
slaxemulator@8085
|
451 +putc:
|
slaxemulator@8085
|
452 + movb $0xe, %ah
|
slaxemulator@8085
|
453 + movw $7, %bx # one dot each 64k
|
slaxemulator@8085
|
454 + int $0x10
|
slaxemulator@8085
|
455 + cmp $0xd, %al # CR ?
|
slaxemulator@8085
|
456 + je putclf
|
slaxemulator@8085
|
457 + ret
|
pascal@16547
|
458
|
pascal@15203
|
459 +#ifdef KEYBOARDLESS_SUPPORT
|
slaxemulator@8085
|
460 +clock = 0x46C
|
slaxemulator@8085
|
461 +wait:
|
slaxemulator@8085
|
462 +wait4key:
|
slaxemulator@8085
|
463 + movw $clock, %di
|
slaxemulator@8085
|
464 +#define DELAY 5
|
pascal@15203
|
465 + movb $257-(DELAY*182)/10, %fs:(%di)
|
slaxemulator@8085
|
466 +waitkbd:
|
slaxemulator@8085
|
467 + movw $0x10D, %ax # test keyboard, timeout => CR
|
pascal@15203
|
468 + cmpb %fs:(%di),%ah
|
slaxemulator@8085
|
469 + je waitdone
|
pascal@12556
|
470 + int $0x16
|
slaxemulator@8085
|
471 + jz waitkbd
|
slaxemulator@8085
|
472 + cbw
|
slaxemulator@8085
|
473 + int $0x16 # eat char
|
pascal@12556
|
474 + movw %di, %fs # disable timeout
|
slaxemulator@8085
|
475 + incw %di # clear Z
|
slaxemulator@8085
|
476 +waitdone:
|
slaxemulator@8085
|
477 + ret
|
pascal@15203
|
478 +#endif
|
pascal@16547
|
479 +
|
pascal@15203
|
480 +#ifdef EXE_SUPPORT
|
pascal@15203
|
481 +comstart:
|
pascal@15203
|
482 + cld # assume nothing
|
pascal@15203
|
483 + pushw $INITSEG
|
pascal@15203
|
484 + popw %es
|
pascal@15203
|
485 + pushw %es
|
pascal@15203
|
486 + popw %ss
|
pascal@15203
|
487 +#ifdef CMDLINE
|
pascal@15203
|
488 + movw %sp, %di
|
pascal@15203
|
489 + movw $0x80, %si
|
pascal@15203
|
490 + lodsb
|
pascal@15203
|
491 + cbw
|
pascal@15203
|
492 + xchgw %ax, %cx
|
pascal@15203
|
493 + rep
|
pascal@15203
|
494 + movsb
|
pascal@15203
|
495 + movb $(48+2)/2, %cl
|
pascal@15203
|
496 + xorw %bx, %bx
|
pascal@15203
|
497 +clearstacklp:
|
pascal@15203
|
498 + pushw %bx
|
pascal@15203
|
499 + loop clearstacklp
|
pascal@15203
|
500 +# ifdef HELP
|
pascal@15203
|
501 + cmpb $'?', -1(%si)
|
pascal@15203
|
502 + movw $EXEADRS(0x200), %si
|
pascal@15203
|
503 + movw setup_sects-0x200(%si), %di // bits 0..6
|
pascal@15203
|
504 + je puts_version
|
pascal@15203
|
505 + smsww %ax
|
pascal@15203
|
506 + andb $1, %al
|
pascal@15203
|
507 + jne puts_version // real mode only...
|
pascal@15203
|
508 +# endif
|
pascal@15203
|
509 +#else
|
pascal@15203
|
510 + movw $(48+2)/2, %cx
|
pascal@15203
|
511 + xorw %bx, %bx
|
pascal@15203
|
512 +clearstacklp:
|
pascal@15203
|
513 + pushw %bx
|
pascal@15203
|
514 + loop clearstacklp
|
pascal@15203
|
515 +#endif
|
pascal@15203
|
516 +#if !defined(CMDLINE) || !defined(HELP)
|
pascal@15203
|
517 + movw EXEADRS(setup_sects), %di // bits 0..6
|
pascal@15203
|
518 + movb $0, %al // access = RO
|
pascal@15203
|
519 +#endif
|
pascal@15203
|
520 + movw 0x2C(%bx), %ds // DOS 3.0+
|
pascal@15203
|
521 +loop1:
|
pascal@15203
|
522 + incw %bx
|
pascal@15203
|
523 + cmpw %cx, (%bx)
|
pascal@15203
|
524 + jne loop1
|
pascal@15203
|
525 + leaw 4(%bx), %dx // %ds:%dx filename
|
pascal@15203
|
526 + movb $0x3D, %ah // open, access = RO
|
pascal@15203
|
527 + int $0x21
|
pascal@15203
|
528 + jc dosexit
|
pascal@15203
|
529 + xchgw %ax, %bp // fd
|
pascal@15203
|
530 + incw %di
|
pascal@15203
|
531 + call read_sectors_dos // update %ds
|
pascal@15203
|
532 + addb $read_sectors_dos-read_sectors, patchcall+1
|
pascal@15203
|
533 +#ifdef CMDLINE
|
pascal@15203
|
534 +# ifdef OLDCMDLINE
|
pascal@15203
|
535 + movw $0x202, %bx
|
pascal@15203
|
536 + cmpw %bx, 0x206-0x202(%bx)
|
pascal@15203
|
537 + jb oldcmdline
|
pascal@15203
|
538 + movw $INITSEG/16+stacktop/256, cmd_line_ptr+1-0x202(%bx)
|
pascal@15203
|
539 +oldcmdline:
|
pascal@15203
|
540 +# else
|
pascal@15203
|
541 + movw $INITSEG/16+stacktop/256, cmd_line_ptr+1
|
pascal@15203
|
542 +# endif
|
pascal@15203
|
543 +#endif
|
pascal@15203
|
544 + ljmp $INITSEG, $loadsys
|
pascal@15206
|
545 +#else
|
pascal@15206
|
546 +swap_floppy:
|
pascal@15206
|
547 + .ascii "Next!"
|
pascal@15206
|
548 + .byte 7,13,0 # swap detection needs 13, 0
|
pascal@15203
|
549 +#endif
|
pascal@15203
|
550 +
|
pascal@16011
|
551 +#define kernel_version_offset 0xE
|
pascal@15203
|
552 +puts_version:
|
pascal@16011
|
553 + addw kernel_version_offset(%si),%si # starting protocol 2.00, Kernel 1.3.73
|
pascal@15203
|
554 +puts:
|
pascal@15203
|
555 + movb $0xd, %al # CR
|
pascal@15203
|
556 +putcs:
|
pascal@15203
|
557 + call putc
|
pascal@15203
|
558 + lodsb
|
pascal@15203
|
559 + cmpb $0, %al # end of string is any byte <= 0
|
pascal@15203
|
560 + jg putcs
|
pascal@15203
|
561 +dosexit:
|
pascal@15203
|
562 + ret
|
slaxemulator@8085
|
563
|
slaxemulator@8085
|
564 # Kernel attributes; used by setup. This is part 1 of the
|
slaxemulator@8085
|
565 # header, from the old boot sector.
|