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| author | Kevin O'Connor <kevin@koconnor.net> | 2009-01-01 18:31:11 -0500 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2009-01-01 18:31:11 -0500 |
| commit | 7f343097712ebdd1f11953c867e208da899b4ba3 (patch) | |
| tree | a2bee74e381ce87766c006975eb03b34ee47b213 /src/farptr.h | |
| parent | 964622410105c28c42378440ac3cb6d1a996da49 (diff) | |
| download | seabios-7f343097712ebdd1f11953c867e208da899b4ba3.tar.gz | |
Switch to new stack when calling ATA function in 16bit mode.
This reduces stack usage (old dos programs don't provide much space).
Diffstat (limited to 'src/farptr.h')
| -rw-r--r-- | src/farptr.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/farptr.h b/src/farptr.h index ad5fee5e..cb301b15 100644 --- a/src/farptr.h +++ b/src/farptr.h @@ -11,6 +11,7 @@ // Dummy definitions used to make sure gcc understands dependencies // between SET_SEG and GET/READ/WRITE_SEG macros. extern u16 __segment_ES, __segment_CS, __segment_DS, __segment_SS; +extern u16 __segment_FS, __segment_GS; // Low level macros for reading/writing memory via a segment selector. #define READ8_SEG(SEG, value, var) \ @@ -98,7 +99,7 @@ extern void __force_link_error__unknown_type(); SET_VAR(ES, (var), __sfv_val); \ } while (0) -// Macros for accesssing a 32bit pointer from 16bit mode. (They +// Macros for accesssing a 32bit pointer from 16bit real mode. (They // automatically update the %es segment, break the pointer into // segment/offset, and then make the access.) #define __GET_FARPTR(ptr) ({ \ @@ -116,7 +117,7 @@ extern void __force_link_error__unknown_type(); // equivalent 16bit segment/offset values. #define FARPTR_TO_SEG(p) (((u32)(p)) >> 4) #define FARPTR_TO_OFFSET(p) (((u32)(p)) & 0xf) -#define MAKE_FARPTR(seg,off) ((void*)(((seg)<<4)+(off))) +#define MAKE_FARPTR(seg,off) ((void*)(((u32)(seg)<<4)+(u32)(off))) #if MODE16 == 1 |