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Pekka Enberg
2f3976eeee
This patch adds BIOS E820 memory map emulation to KVM. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
63 lines
1.6 KiB
C
63 lines
1.6 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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* 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 0x00000400UL
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#define BDA_END 0x000004FFUL
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#define EBDA_START 0x0009FC00UL
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#define EBDA_END 0x0009FFFFUL
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#define E820_MAP_SIZE EBDA_START
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#define E820_MAP_START (EBDA_START + 0x01)
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#define MB_BIOS_BEGIN 0x000f0000
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#define MB_BIOS_END 0x000fffff
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#define VGA_RAM_BEGIN 0x000a0000
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#define VGA_RAM_END 0x000bffff
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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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#define ALIGN(x, a) \
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(((x) + ((a) - 1)) & ~((a) - 1))
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/*
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* note we use 16 bytes alignment which makes segment based
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* addressing easy to compute, dont change it otherwise you
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* may break local variables offsets in BIOS irq routines
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*/
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#define BIOS_NEXT_IRQ_ADDR(addr, size) \
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ALIGN((addr + size + 1), 16)
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#endif /* BIOS_H_ */
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