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| author | H. Peter Anvin <hpa@zytor.com> | 2009-09-02 17:31:53 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2009-09-02 17:32:39 -0700 |
| commit | 94a6e382a7a253fdab67a3bff981844dd5f6d4cb (patch) | |
| tree | a5563377d74fdaec953322ae17d82095fd258d71 /core/init.inc | |
| parent | 33a3c79d6fe333b1d61b29a64fc045ddde89af22 (diff) | |
| download | syslinux-94a6e382a7a253fdab67a3bff981844dd5f6d4cb.tar.gz | |
core: merge cpuinit.inc into init.inc
The separation between cpuinit.inc and init.inc has never been very
clear, and it just made the code harder to read.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'core/init.inc')
| -rw-r--r-- | core/init.inc | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/core/init.inc b/core/init.inc index 5617a697..8e393b67 100644 --- a/core/init.inc +++ b/core/init.inc @@ -44,6 +44,44 @@ common_init: call adjust_screen ; +; CPU-dependent initialization and related checks. +; +check_escapes: + mov ah,02h ; Check keyboard flags + int 16h + mov [KbdFlags],al ; Save for boot prompt check + test al,04h ; Ctrl->skip 386 check + jnz skip_checks + +; +; Now check that there is sufficient low (DOS) memory +; +; NOTE: Linux doesn't use all of real_mode_seg, but we use the same +; segment for COMBOOT images, which can use all 64K +; +dosram_k equ (real_mode_seg+0x1000) >> 6 ; Minimum DOS memory (K) + int 12h + cmp ax,dosram_k + jae enough_ram + mov si,err_noram + call writestr_early + jmp kaboom +enough_ram: +skip_checks: + + section .data16 +err_noram db 'It appears your computer has less than ' + asciidec dosram_k + db 'K of low ("DOS")' + db CR, LF + db 'RAM. Syslinux needs at least this amount to boot. If you get' + db CR, LF + db 'this message in error, hold down the Ctrl key while' + db CR, LF + db 'booting, and I will take your word for it.', CR, LF, 0 + section .text16 + +; ; The code to decompress the PM code and initialize other segments. ; extern _lzo1x_decompress_asm_fast |