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author | Sebastian Schmelzer | 2010-10-25 16:53:54 +0200 |
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committer | Sebastian Schmelzer | 2010-10-25 16:53:54 +0200 |
commit | 3050a9253437f4a4b5ad4bf3b3efdc3c660a5137 (patch) | |
tree | 91ac22153e416aac7ca20916b314b5e2ffa871b1 /contrib/syslinux-4.02/sample/filetest.c | |
download | preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.tar.gz preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.tar.xz preboot-3050a9253437f4a4b5ad4bf3b3efdc3c660a5137.zip |
Diffstat (limited to 'contrib/syslinux-4.02/sample/filetest.c')
-rw-r--r-- | contrib/syslinux-4.02/sample/filetest.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/sample/filetest.c b/contrib/syslinux-4.02/sample/filetest.c new file mode 100644 index 0000000..2ef772a --- /dev/null +++ b/contrib/syslinux-4.02/sample/filetest.c @@ -0,0 +1,97 @@ +#include <com32.h> +#include <stdarg.h> + +#define NULL ((void *)0) +int printf(const char *, ...); +int putchar(int); + +static inline void memset(void *buf, int ch, unsigned int len) +{ + asm volatile ("cld; rep; stosb":"+D" (buf), "+c"(len):"a"(ch):"memory"); +} + +static void strcpy(char *dst, const char *src) +{ + while (*src) + *dst++ = *src++; + + *dst = '\0'; +} + +static void printregs(const com32sys_t * r) +{ + printf("eflags = %08x ds = %04x es = %04x fs = %04x gs = %04x\n" + "eax = %08x ebx = %08x ecx = %08x edx = %08x\n" + "ebp = %08x esi = %08x edi = %08x esp = %08x\n", + r->eflags.l, r->ds, r->es, r->fs, r->gs, + r->eax.l, r->ebx.l, r->ecx.l, r->edx.l, + r->ebp.l, r->esi.l, r->edi.l, r->_unused_esp.l); +} + +int __start(void) +{ + unsigned int ax, cx, si, t; + com32sys_t inreg, outreg; + char *p; + + /* Test null system call */ + inreg.eflags.l = 0xffffffff; + inreg.eax.l = 0x11110000; + inreg.ecx.l = 0x22222222; + inreg.edx.l = 0x33333333; + inreg.ebx.l = 0x44444444; + inreg.ebp.l = 0x55555555; + inreg.esi.l = 0x66666666; + inreg.edi.l = 0x77777777; + inreg.ds = 0xaaaa; + inreg.es = 0xbbbb; + inreg.fs = 0xcccc; + inreg.gs = 0xdddd; + printregs(&inreg); + __com32.cs_intcall(0x22, &inreg, &outreg); + printregs(&outreg); + printf("----\n"); + + memset(&inreg, 0, sizeof inreg); + memset(&outreg, 0, sizeof outreg); + strcpy(__com32.cs_bounce, "test.txt"); + inreg.eax.w[0] = 0x0006; // Open file + inreg.esi.w[0] = OFFS(__com32.cs_bounce); + inreg.es = SEG(__com32.cs_bounce); + printregs(&inreg); + __com32.cs_intcall(0x22, &inreg, &outreg); + printregs(&outreg); + printf("----\n"); + + si = outreg.esi.w[0]; /* File handle */ + cx = outreg.ecx.w[0]; /* Block size */ + ax = outreg.eax.l; /* File length */ + + while (si) { + /* We can only read 64K per call */ + t = (ax > 65536) ? 65536 / cx : (ax + cx - 1) / cx; + + memset(&inreg, 0, sizeof inreg); + inreg.esi.w[0] = si; + inreg.ecx.w[0] = t; /* Block count */ + inreg.eax.w[0] = 0x0007; // Read file + inreg.ebx.w[0] = OFFS(__com32.cs_bounce); + inreg.es = SEG(__com32.cs_bounce); + printregs(&inreg); + __com32.cs_intcall(0x22, &inreg, &outreg); + printregs(&outreg); + printf("----\n"); + si = outreg.esi.w[0]; + + /* Print the buffer */ + t = (ax < 65536) ? ax : 65536; + p = __com32.cs_bounce; + while (t) { + putchar(*p++); + t--; + ax--; + } + } + + return 0; +} |