| 1 | /* |
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| 2 | * Special handling for the MS-DOS derivative: syslinux_ldlinux |
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| 3 | * is a "far" object... |
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| 4 | */ |
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| 5 | |
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| 6 | #define _XOPEN_SOURCE 500 /* Required on glibc 2.x */ |
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| 7 | #define _BSD_SOURCE |
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| 8 | #include <inttypes.h> |
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| 9 | #include <string.h> |
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| 10 | #include <stddef.h> |
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| 11 | #include <stdlib.h> |
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| 12 | |
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| 13 | #include "syslxint.h" |
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| 14 | |
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| 15 | #define __noinline __attribute__((noinline)) |
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| 16 | |
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| 17 | #if 0 /* unused */ |
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| 18 | uint8_t get_8_sl(const uint8_t * p) |
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| 19 | { |
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| 20 | uint8_t v; |
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| 21 | |
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| 22 | p = set_fs(p); |
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| 23 | asm volatile("movb %%fs:%1,%0":"=q" (v):"m"(*p)); |
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| 24 | return v; |
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| 25 | } |
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| 26 | #endif |
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| 27 | |
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| 28 | uint16_t get_16_sl(const uint16_t * p) |
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| 29 | { |
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| 30 | uint16_t v; |
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| 31 | |
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| 32 | p = set_fs(p); |
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| 33 | asm volatile("movw %%fs:%1,%0":"=r" (v):"m"(*p)); |
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| 34 | return v; |
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| 35 | } |
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| 36 | |
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| 37 | uint32_t get_32_sl(const uint32_t * p) |
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| 38 | { |
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| 39 | uint32_t v; |
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| 40 | |
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| 41 | p = set_fs(p); |
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| 42 | asm volatile("movl %%fs:%1,%0":"=r" (v):"m"(*p)); |
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| 43 | return v; |
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| 44 | } |
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| 45 | |
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| 46 | #if 0 /* unused */ |
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| 47 | uint64_t get_64_sl(const uint64_t * p) |
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| 48 | { |
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| 49 | uint32_t v0, v1; |
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| 50 | const uint32_t *pp = (const uint32_t *)set_fs(p); |
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| 51 | |
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| 52 | asm volatile("movl %%fs:%1,%0" : "=r" (v0) : "m" (pp[0])); |
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| 53 | asm volatile("movl %%fs:%1,%0" : "=r" (v1) : "m" (pp[1])); |
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| 54 | return v0 + ((uint64_t)v1 << 32); |
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| 55 | } |
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| 56 | #endif |
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| 57 | |
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| 58 | #if 0 /* unused */ |
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| 59 | void set_8_sl(uint8_t * p, uint8_t v) |
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| 60 | { |
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| 61 | p = set_fs(p); |
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| 62 | asm volatile("movb %1,%%fs:%0":"=m" (*p):"qi"(v)); |
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| 63 | } |
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| 64 | #endif |
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| 65 | |
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| 66 | void set_16_sl(uint16_t * p, uint16_t v) |
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| 67 | { |
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| 68 | p = set_fs(p); |
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| 69 | asm volatile("movw %1,%%fs:%0":"=m" (*p):"ri"(v)); |
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| 70 | } |
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| 71 | |
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| 72 | void set_32_sl(uint32_t * p, uint32_t v) |
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| 73 | { |
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| 74 | p = set_fs(p); |
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| 75 | asm volatile("movl %1,%%fs:%0":"=m" (*p):"ri"(v)); |
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| 76 | } |
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| 77 | |
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| 78 | void set_64_sl(uint64_t * p, uint64_t v) |
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| 79 | { |
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| 80 | uint32_t *pp = (uint32_t *)set_fs(p); |
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| 81 | asm volatile("movl %1,%%fs:%0" : "=m" (pp[0]) : "ri"((uint32_t)v)); |
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| 82 | asm volatile("movl %1,%%fs:%0" : "=m" (pp[1]) : "ri"((uint32_t)(v >> 32))); |
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| 83 | } |
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| 84 | |
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| 85 | void memcpy_to_sl(void *dst, const void *src, size_t len) |
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| 86 | { |
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| 87 | uint16_t seg; |
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| 88 | uint16_t off; |
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| 89 | |
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| 90 | seg = ds() + ((size_t)dst >> 4); |
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| 91 | off = (size_t)dst & 15; |
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| 92 | |
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| 93 | asm volatile("pushw %%es ; " |
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| 94 | "movw %3,%%es ; " |
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| 95 | "rep ; movsb ; " |
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| 96 | "popw %%es" |
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| 97 | : "+D" (off), "+S" (src), "+c" (len) |
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| 98 | : "r" (seg) |
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| 99 | : "memory"); |
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| 100 | } |
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| 101 | |
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| 102 | void memcpy_from_sl(void *dst, const void *src, size_t len) |
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| 103 | { |
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| 104 | uint16_t seg; |
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| 105 | uint16_t off; |
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| 106 | |
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| 107 | seg = ds() + ((size_t)src >> 4); |
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| 108 | off = (size_t)src & 15; |
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| 109 | |
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| 110 | asm volatile("pushw %%ds ; " |
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| 111 | "movw %3,%%ds ; " |
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| 112 | "rep ; movsb ; " |
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| 113 | "popw %%ds" |
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| 114 | : "+D" (dst), "+S" (off), "+c" (len) |
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| 115 | : "r" (seg) |
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| 116 | : "memory"); |
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| 117 | } |
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