diff options
Diffstat (limited to 'contrib/syslinux-4.02/dos/getsetsl.c')
-rw-r--r-- | contrib/syslinux-4.02/dos/getsetsl.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/dos/getsetsl.c b/contrib/syslinux-4.02/dos/getsetsl.c new file mode 100644 index 0000000..67e954d --- /dev/null +++ b/contrib/syslinux-4.02/dos/getsetsl.c @@ -0,0 +1,117 @@ +/* + * Special handling for the MS-DOS derivative: syslinux_ldlinux + * is a "far" object... + */ + +#define _XOPEN_SOURCE 500 /* Required on glibc 2.x */ +#define _BSD_SOURCE +#include <inttypes.h> +#include <string.h> +#include <stddef.h> +#include <stdlib.h> + +#include "syslxint.h" + +#define __noinline __attribute__((noinline)) + +#if 0 /* unused */ +uint8_t get_8_sl(const uint8_t * p) +{ + uint8_t v; + + p = set_fs(p); + asm volatile("movb %%fs:%1,%0":"=q" (v):"m"(*p)); + return v; +} +#endif + +uint16_t get_16_sl(const uint16_t * p) +{ + uint16_t v; + + p = set_fs(p); + asm volatile("movw %%fs:%1,%0":"=r" (v):"m"(*p)); + return v; +} + +uint32_t get_32_sl(const uint32_t * p) +{ + uint32_t v; + + p = set_fs(p); + asm volatile("movl %%fs:%1,%0":"=r" (v):"m"(*p)); + return v; +} + +#if 0 /* unused */ +uint64_t get_64_sl(const uint64_t * p) +{ + uint32_t v0, v1; + const uint32_t *pp = (const uint32_t *)set_fs(p); + + asm volatile("movl %%fs:%1,%0" : "=r" (v0) : "m" (pp[0])); + asm volatile("movl %%fs:%1,%0" : "=r" (v1) : "m" (pp[1])); + return v0 + ((uint64_t)v1 << 32); +} +#endif + +#if 0 /* unused */ +void set_8_sl(uint8_t * p, uint8_t v) +{ + p = set_fs(p); + asm volatile("movb %1,%%fs:%0":"=m" (*p):"qi"(v)); +} +#endif + +void set_16_sl(uint16_t * p, uint16_t v) +{ + p = set_fs(p); + asm volatile("movw %1,%%fs:%0":"=m" (*p):"ri"(v)); +} + +void set_32_sl(uint32_t * p, uint32_t v) +{ + p = set_fs(p); + asm volatile("movl %1,%%fs:%0":"=m" (*p):"ri"(v)); +} + +void set_64_sl(uint64_t * p, uint64_t v) +{ + uint32_t *pp = (uint32_t *)set_fs(p); + asm volatile("movl %1,%%fs:%0" : "=m" (pp[0]) : "ri"((uint32_t)v)); + asm volatile("movl %1,%%fs:%0" : "=m" (pp[1]) : "ri"((uint32_t)(v >> 32))); +} + +void memcpy_to_sl(void *dst, const void *src, size_t len) +{ + uint16_t seg; + uint16_t off; + + seg = ds() + ((size_t)dst >> 4); + off = (size_t)dst & 15; + + asm volatile("pushw %%es ; " + "movw %3,%%es ; " + "rep ; movsb ; " + "popw %%es" + : "+D" (off), "+S" (src), "+c" (len) + : "r" (seg) + : "memory"); +} + +void memcpy_from_sl(void *dst, const void *src, size_t len) +{ + uint16_t seg; + uint16_t off; + + seg = ds() + ((size_t)src >> 4); + off = (size_t)src & 15; + + asm volatile("pushw %%ds ; " + "movw %3,%%ds ; " + "rep ; movsb ; " + "popw %%ds" + : "+D" (dst), "+S" (off), "+c" (len) + : "r" (seg) + : "memory"); +} |