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https://github.com/clearlinux/kvmtool.git
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Andre Przywara
f23171ca13
For x86 the files that become the BIOS blob are compiled with -m32.
Although we avoid including any system libraries, we use some headers
from /usr/include, which asks for trouble if compiling on a x86-64
multiarch system (Debian/Ubuntu). Without 32-bit compat headers
installed there, the compiler will not find the right files.
However as the BIOS code is actually a self-contained binary without
any relationship to the Linux userland, it should not use or rely
on Linux system headers.
Replace includes of linux/types.h in BIOS code with asm/bios/types.h,
which simply contains the u{8,16,32,64} data types needed by the code.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
#ifndef BIOS_H_
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#define BIOS_H_
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/*
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* X86-32 Memory Map (typical)
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* start end
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* Real Mode Interrupt Vector Table 0x00000000 0x000003FF
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* BDA area 0x00000400 0x000004FF
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* Conventional Low Memory 0x00000500 0x0009FBFF
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* EBDA area 0x0009FC00 0x0009FFFF
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* VIDEO RAM 0x000A0000 0x000BFFFF
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* VIDEO ROM (BIOS) 0x000C0000 0x000C7FFF
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* ROMs & unus. space (mapped hw & misc)0x000C8000 0x000EFFFF 160 KiB (typically)
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* Motherboard BIOS 0x000F0000 0x000FFFFF
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* Extended Memory 0x00100000 0xFEBFFFFF
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* Reserved (configs, ACPI, PnP, etc) 0xFEC00000 0xFFFFFFFF
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*/
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#define REAL_MODE_IVT_BEGIN 0x00000000
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#define REAL_MODE_IVT_END 0x000003ff
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#define BDA_START 0x00000400
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#define BDA_END 0x000004ff
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#define EBDA_START 0x0009fc00
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#define EBDA_END 0x0009ffff
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#define E820_MAP_START EBDA_START
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#define MB_BIOS_BEGIN 0x000f0000
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#define MB_FIRMWARE_BIOS_BEGIN 0x000e0000
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#define MB_BIOS_END 0x000fffff
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#define MB_BIOS_SIZE (MB_BIOS_END - MB_BIOS_BEGIN + 1)
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#define MB_FIRMWARE_BIOS_SIZE (MB_BIOS_END - MB_FIRMWARE_BIOS_BEGIN + 1)
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#define VGA_RAM_BEGIN 0x000a0000
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#define VGA_RAM_END 0x000bffff
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#define VGA_ROM_BEGIN 0x000c0000
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#define VGA_ROM_OEM_STRING VGA_ROM_BEGIN
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#define VGA_ROM_OEM_STRING_SIZE 16
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#define VGA_ROM_MODES (VGA_ROM_OEM_STRING + VGA_ROM_OEM_STRING_SIZE)
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#define VGA_ROM_MODES_SIZE 32
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#define VGA_ROM_END 0x000c7fff
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/* we handle one page only */
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#define VGA_RAM_SEG (VGA_RAM_BEGIN >> 4)
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#define VGA_PAGE_SIZE 0x007d0 /* 80x25 */
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/* real mode interrupt vector table */
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#define REAL_INTR_BASE REAL_MODE_IVT_BEGIN
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#define REAL_INTR_VECTORS 256
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/*
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* BIOS stack must be at absolute predefined memory address
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* We reserve 64 bytes for BIOS stack
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*/
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#define MB_BIOS_SS 0xfff7
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#define MB_BIOS_SP 0x40
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/*
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* When interfere with assembler code we need to be sure how
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* arguments are passed in real mode.
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*/
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#define bioscall __attribute__((regparm(3)))
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#ifndef __ASSEMBLER__
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#include <asm/bios/types.h>
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struct biosregs {
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u32 eax;
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u32 ebx;
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u32 ecx;
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u32 edx;
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u32 esp;
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u32 ebp;
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u32 esi;
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u32 edi;
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u32 ds;
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u32 es;
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u32 fs;
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u32 eip;
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u32 eflags;
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};
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extern bioscall void int10_handler(struct biosregs *regs);
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extern bioscall void int15_handler(struct biosregs *regs);
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#endif
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#endif /* BIOS_H_ */
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