search for: cs_intcall

...t ax,cx,dx,es,si,di,t; com32sys_t inreg,outreg; memset(&inreg, 0, sizeof inreg); memset(&outreg, 0, sizeof outreg); strcopy(__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); __com32.cs_intcall(0x22, &inreg, &outreg); si = outreg.esi.w[0]; cx = outreg.ecx.w[0]; ax = outreg.eax.w[0]; if ((ax % cx) == 0) t = ax / cx; else t = (ax / cx) + 1; memset(&inreg, 0, sizeof inreg); inreg.esi.w[0] = si; inreg.ecx.w[0] = t; inreg.eax.w[0] = 0x0007; // Read file inreg.ebx.w[0] = OFFS(__c...

Rather than acting like a typical C program using argc/argv, cmd.c32 uses __com32.cs_cmdline to retrieve what's passed to it. meminfo.c32 uses __intcall() which in the library calls __com32.cs_intcall(). Is __com32 only exposed for library functions or is there something else missing in here? Should accessing __com32.cs_cmdline be abstracted via a function call for protection? Should cmd.c32 use argc/argv instead? If we were to abstract/protect via a function call, I'd expect the call to...

...ude <string.h> +#include <unistd.h> +#include <fcntl.h> + +int closedir(DIR *dir) +{ + int rv; + com32sys_t regs; + if (dir == NULL) { + rv = 0; + } else { + memset(&regs, 0, sizeof regs); /* ?Needed? */ + regs.eax.w[0] = 0x0022; + regs.esi.w[0] = dir->dd_fd; + __com32.cs_intcall(0x22, &regs, &regs); + free(dir); /* garbage collection? */ + rv = 0; + } + return rv; +} diff --git a/com32/lib/fdopendir.c b/com32/lib/fdopendir.c new file mode 100644 index 0000000..83a7ac6 --- /dev/null +++ b/com32/lib/fdopendir.c @@ -0,0 +1,13 @@ +/* + * fdopendir.c + */ + +#include...

...ude <string.h> +#include <unistd.h> +#include <fcntl.h> + +int closedir(DIR *dir) +{ + int rv; + com32sys_t regs; + if (dir == NULL) { + rv = 0; + } else { + memset(&regs, 0, sizeof regs); /* ?Needed? */ + regs.eax.w[0] = 0x0021; + regs.esi.w[0] = dir->dd_fd; + __com32.cs_intcall(0x22, &regs, &regs); + free(dir); /* garbage collection? */ + rv = 0; + } + return rv; +} diff --git a/com32/lib/fdopendir.c b/com32/lib/fdopendir.c new file mode 100644 index 0000000..83a7ac6 --- /dev/null +++ b/com32/lib/fdopendir.c @@ -0,0 +1,13 @@ +/* + * fdopendir.c + */ + +#include...

Hi, I would like to use INT22h, function 000Dh, but I found that it is disabled in vector table: in core/comboot.inc: int22_table: [...] dw comapi_err ; 000D clean up then bootstrap [...] The code of this function is present in this file (comapi_chainboot). Why this function is disabled? Regards Piotr Romaniuk PS I am using syslinux-4.04.

...com32.h> ?int chdir(const char *path) ?{ -??? errno = ENOSYS; -??? return -1; +??? com32sys_t regs; + +??? strlcpy(__com32.cs_bounce, path, __com32.cs_bounce_size); + +??? regs.eax.w[0] = 0x0025; +??? regs.esi.w[0] = OFFS(__com32.cs_bounce); +??? regs.es = SEG(__com32.cs_bounce); + +??? __com32.cs_intcall(0x22, &regs, &regs); + +??? if (!(regs.eflags.l & EFLAGS_CF)) { +??? ??? return -1; +??? } + +??? /* We're done */ +??? return 0; ?} + diff -u -r -X nodiff syslinux-3.82-orig/core/comboot.inc syslinux-3.82/core/comboot.inc --- syslinux-3.82-orig/core/comboot.inc 2009-06-09 10:19:...

...turns a structure pointer in SI * to a structure whose first member happens to be the LBA. */ inregs.eax.w[0] = 0x0006; - inregs.esi.w[0] = OFFS(__com32.cs_bounce); - inregs.es = SEG(__com32.cs_bounce); + inregs.esi.w[0] = OFFS(buf); + inregs.es = SEG(buf); __com32.cs_intcall(0x22, &inregs, &inregs); if ((inregs.eflags.l & EFLAGS_CF) || inregs.esi.w[0] == 0) { - return 0; /* Filename not found */ + goto fail; /* Filename not found */ } /* Since the first member is the LBA, we simply cast */ @@ -121,14 +127,16 @@ uint32_t get_file_lba(con...

From: Matt Fleming <matt.fleming at intel.com> Since we can't use __intcall() for EFI, and since we can now have the ELF module code resolve all our symbols at runtime, we should delete as many references to __intcall() as possible and just access the symbols directly. The most interesting patch is the support for weak symbols. We need to be able to reference derivative-specific

...bounce buffer */ strlcpy(buf, filename, size); - /* Call comapi_open() which returns a structure pointer in SI - * to a structure whose first member happens to be the LBA. - */ - inregs.eax.w[0] = 0x0006; - inregs.esi.w[0] = OFFS(buf); - inregs.es = SEG(buf); - __com32.cs_intcall(0x22, &inregs, &inregs); - - if ((inregs.eflags.l & EFLAGS_CF) || inregs.esi.w[0] == 0) { + if (open_file(buf, &fd) <= 0) { goto fail; /* Filename not found */ } /* Since the first member is the LBA, we simply cast */ - lba = *((uint32_t *) MK_PTR(inregs.d...