diff options
Diffstat (limited to 'qemu/roms/seabios/src/biosvar.h')
| -rw-r--r-- | qemu/roms/seabios/src/biosvar.h | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/qemu/roms/seabios/src/biosvar.h b/qemu/roms/seabios/src/biosvar.h new file mode 100644 index 000000000..58bcbcedb --- /dev/null +++ b/qemu/roms/seabios/src/biosvar.h @@ -0,0 +1,130 @@ +// Memory access to BIOS variables. +// +// Copyright (C) 2008-2013 Kevin O'Connor <kevin@koconnor.net> +// +// This file may be distributed under the terms of the GNU LGPLv3 license. +#ifndef __BIOSVAR_H +#define __BIOSVAR_H + +#include "config.h" // SEG_BDA +#include "farptr.h" // GET_FARVAR +#include "std/bda.h" // struct bios_data_area_s + + +/**************************************************************** + * Interupt vector table + ****************************************************************/ + +#define GET_IVT(vector) \ + GET_FARVAR(SEG_IVT, ((struct rmode_IVT *)0)->ivec[vector]) +#define SET_IVT(vector, segoff) \ + SET_FARVAR(SEG_IVT, ((struct rmode_IVT *)0)->ivec[vector], segoff) + +#define FUNC16(func) ({ \ + ASSERT32FLAT(); \ + extern void func (void); \ + SEGOFF(SEG_BIOS, (u32)func - BUILD_BIOS_ADDR); \ + }) + + +/**************************************************************** + * Bios Data Area (BDA) + ****************************************************************/ + +// Accessor functions +#define GET_BDA(var) \ + GET_FARVAR(SEG_BDA, ((struct bios_data_area_s *)0)->var) +#define SET_BDA(var, val) \ + SET_FARVAR(SEG_BDA, ((struct bios_data_area_s *)0)->var, (val)) + +// Helper function to set the bits of the equipment_list_flags variable. +static inline void set_equipment_flags(u16 clear, u16 set) { + u16 eqf = GET_BDA(equipment_list_flags); + SET_BDA(equipment_list_flags, (eqf & ~clear) | set); +} + + +/**************************************************************** + * Extended Bios Data Area (EBDA) + ****************************************************************/ + +// The initial size and location of EBDA +#define EBDA_SIZE_START \ + DIV_ROUND_UP(sizeof(struct extended_bios_data_area_s), 1024) +#define EBDA_SEGMENT_START \ + FLATPTR_TO_SEG(BUILD_LOWRAM_END - EBDA_SIZE_START*1024) + +// Accessor functions +static inline u16 get_ebda_seg(void) { + return GET_BDA(ebda_seg); +} +static inline struct extended_bios_data_area_s * +get_ebda_ptr(void) +{ + ASSERT32FLAT(); + return MAKE_FLATPTR(get_ebda_seg(), 0); +} +#define GET_EBDA(eseg, var) \ + GET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var) +#define SET_EBDA(eseg, var, val) \ + SET_FARVAR(eseg, ((struct extended_bios_data_area_s *)0)->var, (val)) + + +/**************************************************************** + * Global variables + ****************************************************************/ + +#if MODE16 == 0 && MODESEGMENT == 1 +// In 32bit segmented mode %cs may not be readable and the code may be +// relocated. The entry code sets up %gs with a readable segment and +// the code offset can be determined by get_global_offset(). +#define GLOBAL_SEGREG GS +static inline u32 __attribute_const get_global_offset(void) { + u32 ret; + asm(" calll 1f\n" + "1:popl %0\n" + " subl $1b, %0" + : "=r"(ret)); + return ret; +} +#else +#define GLOBAL_SEGREG CS +static inline u32 __attribute_const get_global_offset(void) { + return 0; +} +#endif +static inline u16 get_global_seg(void) { + return GET_SEG(GLOBAL_SEGREG); +} +#define GET_GLOBAL(var) \ + GET_VAR(GLOBAL_SEGREG, *(typeof(&(var)))((void*)&(var) \ + + get_global_offset())) +#if MODESEGMENT +#define GLOBALFLAT2GLOBAL(var) ((typeof(var))((void*)(var) - BUILD_BIOS_ADDR)) +#else +#define GLOBALFLAT2GLOBAL(var) (var) +#endif +// Access a "flat" pointer known to point to the f-segment. +#define GET_GLOBALFLAT(var) GET_GLOBAL(*GLOBALFLAT2GLOBAL(&(var))) + + +/**************************************************************** + * "Low" memory variables + ****************************************************************/ + +extern u8 _zonelow_seg, zonelow_base[]; +#define SEG_LOW ((u32)&_zonelow_seg) + +#if MODESEGMENT +#define GET_LOW(var) GET_FARVAR(SEG_LOW, (var)) +#define SET_LOW(var, val) SET_FARVAR(SEG_LOW, (var), (val)) +#define LOWFLAT2LOW(var) ((typeof(var))((void*)(var) - (u32)zonelow_base)) +#else +#define GET_LOW(var) (var) +#define SET_LOW(var, val) do { (var) = (val); } while (0) +#define LOWFLAT2LOW(var) (var) +#endif +#define GET_LOWFLAT(var) GET_LOW(*LOWFLAT2LOW(&(var))) +#define SET_LOWFLAT(var, val) SET_LOW(*LOWFLAT2LOW(&(var)), (val)) + +#endif // __BIOSVAR_H |