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| author | Kevin O'Connor <kevin@koconnor.net> | 2010-07-25 14:04:01 -0400 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2010-07-25 14:04:01 -0400 |
| commit | 0f788893a8bbad95edcdf3db5009642633dee7dc (patch) | |
| tree | 7c4805b545ab5b86c82c0c5a2e01c7150af3cb51 | |
| parent | aec19c9f22992944aa7d9c09ba4d5255aade3419 (diff) | |
| download | seabios-0f788893a8bbad95edcdf3db5009642633dee7dc.zip seabios-0f788893a8bbad95edcdf3db5009642633dee7dc.tar.gz seabios-0f788893a8bbad95edcdf3db5009642633dee7dc.tar.bz2 | |
Avoid code addresses >64K in big real mode.
Kvm has some limitations with code addresses in big real mode, so
avoid doing that.
| -rw-r--r-- | src/misc.c | 4 | ||||
| -rw-r--r-- | src/romlayout.S | 2 |
2 files changed, 3 insertions, 3 deletions
@@ -156,8 +156,8 @@ u64 rombios32_gdt[] VAR16VISIBLE __aligned(8) = { GDT_LIMIT(BUILD_BIOS_SIZE-1) | GDT_CODE | GDT_BASE(BUILD_BIOS_ADDR), // 16 bit data segment base=0x0 limit=0xffff (SEG32_MODE16_DS) GDT_LIMIT(0x0ffff) | GDT_DATA, - // 16 bit code segment base=0 limit=0xffffffff (SEG32_MODE16BIG_CS) - GDT_LIMIT(0xfffff) | GDT_CODE | GDT_G, + // 16 bit code segment base=0xf0000 limit=0xffffffff (SEG32_MODE16BIG_CS) + GDT_LIMIT(0xfffff) | GDT_CODE | GDT_G | GDT_BASE(BUILD_BIOS_ADDR), // 16 bit data segment base=0 limit=0xffffffff (SEG32_MODE16BIG_DS) GDT_LIMIT(0xfffff) | GDT_DATA | GDT_G, }; diff --git a/src/romlayout.S b/src/romlayout.S index 54e5a4d..a469596 100644 --- a/src/romlayout.S +++ b/src/romlayout.S @@ -105,7 +105,7 @@ transition16big: movw %ax, %fs movw %ax, %gs - ljmpl $SEG32_MODE16BIG_CS, $(BUILD_BIOS_ADDR + 1f) + ljmpw $SEG32_MODE16BIG_CS, $1f .code16gcc 1: |