| #ifndef BIOS_H_ |
| #define BIOS_H_ |
| |
| /* |
| * X86-32 Memory Map (typical) |
| * start end |
| * Real Mode Interrupt Vector Table 0x00000000 0x000003FF |
| * BDA area 0x00000400 0x000004FF |
| * Conventional Low Memory 0x00000500 0x0009FBFF |
| * EBDA area 0x0009FC00 0x0009FFFF |
| * VIDEO RAM 0x000A0000 0x000BFFFF |
| * VIDEO ROM (BIOS) 0x000C0000 0x000C7FFF |
| * Motherboard BIOS 0x000F0000 0x000FFFFF |
| * Extended Memory 0x00100000 0xFEBFFFFF |
| * Reserved (configs, ACPI, PnP, etc) 0xFEC00000 0xFFFFFFFF |
| */ |
| |
| #define REAL_MODE_IVT_BEGIN 0x00000000 |
| #define REAL_MODE_IVT_END 0x000003ff |
| |
| #define BDA_START 0x00000400 |
| #define BDA_END 0x000004ff |
| |
| #define EBDA_START 0x0009fc00 |
| #define EBDA_END 0x0009ffff |
| |
| #define E820_MAP_START EBDA_START |
| |
| #define MB_BIOS_BEGIN 0x000f0000 |
| #define MB_BIOS_END 0x000fffff |
| |
| #define VGA_RAM_BEGIN 0x000a0000 |
| #define VGA_RAM_END 0x000bffff |
| |
| #define VGA_ROM_BEGIN 0x000c0000 |
| #define VGA_ROM_END 0x000c7fff |
| |
| /* we handle one page only */ |
| #define VGA_RAM_SEG (VGA_RAM_BEGIN >> 4) |
| #define VGA_PAGE_SIZE 0x007d0 /* 80x25 */ |
| |
| /* real mode interrupt vector table */ |
| #define REAL_INTR_BASE REAL_MODE_IVT_BEGIN |
| #define REAL_INTR_VECTORS 256 |
| |
| /* |
| * BIOS stack must be at absolute predefined memory address |
| * We reserve 64 bytes for BIOS stack |
| */ |
| #define MB_BIOS_SS 0xfff7 |
| #define MB_BIOS_SP 0x40 |
| |
| /* |
| * When interfere with assembler code we need to be sure how |
| * arguments are passed in real mode. |
| */ |
| #define bioscall __attribute__((regparm(3))) |
| |
| #endif /* BIOS_H_ */ |
