diff options
Diffstat (limited to 'comboot.doc')
| -rw-r--r-- | comboot.doc | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/comboot.doc b/comboot.doc index 3c806c3b..2939f9b7 100644 --- a/comboot.doc +++ b/comboot.doc @@ -85,6 +85,7 @@ The following arguments are passed to the program on the stack: [ESP+16] dword Pointer to low memory bounce buffer [ESP+20] dword Size of low memory bounce buffer [ESP+24] dword Pointer to FAR call helper function (new in 2.05) + [ESP+28] dword Pointer to CDECL helper function (new in 3.xx) This corresponds to the following C prototype, available in the file com32/include/com32.h: @@ -95,7 +96,9 @@ int _start(unsigned int __nargs, void (*__intcall)(uint8_t, com32sys_t *, com32sys_t *), void *__bounce_ptr, unsigned int __bounce_len, - void (*__farcall)(uint32_t, uint16_t, com32sys_t *, com32sys_t *)); + void (*__farcall)(uint32_t, com32sys_t *, com32sys_t *), + int (*__cfarcall)(uint32_t, void *, size_t) + ); The intcall helper function can be used to issue BIOS or SYSLINUX API calls, and takes the interrupt number as first argument. The second @@ -138,6 +141,10 @@ The farcall helper function behaves similarly, but takes as its first argument the CS:IP (in the form (CS << 16) + IP) of procedure to be invoked via a FAR CALL. +The cfarcall helper function takes (CS << 16)+IP, a pointer to a stack +frame, a size of that stack frame, and returns the return value of EAX +(which may need to be appropriate truncated by the user.) + ++++ SYSLINUX API CALLS +++ |