diff options
Diffstat (limited to 'qemu/roms/seabios/vgasrc/vgainit.c')
| -rw-r--r-- | qemu/roms/seabios/vgasrc/vgainit.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/qemu/roms/seabios/vgasrc/vgainit.c b/qemu/roms/seabios/vgasrc/vgainit.c new file mode 100644 index 000000000..8d1226182 --- /dev/null +++ b/qemu/roms/seabios/vgasrc/vgainit.c @@ -0,0 +1,195 @@ +// Main VGA bios initialization +// +// Copyright (C) 2009-2013 Kevin O'Connor <kevin@koconnor.net> +// Copyright (C) 2001-2008 the LGPL VGABios developers Team +// +// This file may be distributed under the terms of the GNU LGPLv3 license. + +#include "biosvar.h" // SET_BDA +#include "bregs.h" // struct bregs +#include "hw/pci.h" // pci_config_readw +#include "hw/pci_regs.h" // PCI_VENDOR_ID +#include "hw/serialio.h" // serial_debug_preinit +#include "output.h" // dprintf +#include "std/optionrom.h" // struct pci_data +#include "std/pmm.h" // struct pmmheader +#include "string.h" // checksum_far +#include "util.h" // VERSION +#include "vgabios.h" // video_save_pointer_table +#include "vgahw.h" // vgahw_setup + +struct video_save_pointer_s video_save_pointer_table VAR16; + +struct video_param_s video_param_table[29] VAR16; + +// Type of emulator platform - for dprintf with certain compile options. +int PlatformRunningOn VAR16; + + +/**************************************************************** + * PCI Data + ****************************************************************/ + +struct pci_data rom_pci_data VAR16 VISIBLE16 = { + .signature = PCI_ROM_SIGNATURE, + .vendor = CONFIG_VGA_VID, + .device = CONFIG_VGA_DID, + .dlen = 0x18, + .class_hi = 0x300, + .irevision = 1, + .type = PCIROM_CODETYPE_X86, + .indicator = 0x80, +}; + + +/**************************************************************** + * PMM call and extra stack setup + ****************************************************************/ + +u16 ExtraStackSeg VAR16 VISIBLE16; + +static void +allocate_extra_stack(void) +{ + if (!CONFIG_VGA_ALLOCATE_EXTRA_STACK) + return; + u32 pmmscan; + for (pmmscan=0; pmmscan < BUILD_BIOS_SIZE; pmmscan+=16) { + struct pmmheader *pmm = (void*)pmmscan; + if (GET_FARVAR(SEG_BIOS, pmm->signature) != PMM_SIGNATURE) + continue; + if (checksum_far(SEG_BIOS, pmm, GET_FARVAR(SEG_BIOS, pmm->length))) + continue; + struct segoff_s entry = GET_FARVAR(SEG_BIOS, pmm->entry); + dprintf(1, "Attempting to allocate VGA stack via pmm call to %04x:%04x\n" + , entry.seg, entry.offset); + u16 res1, res2; + asm volatile( + "pushl %0\n" + "pushw $(8|1)\n" // Permanent low memory request + "pushl $0xffffffff\n" // Anonymous handle + "pushl $" __stringify(CONFIG_VGA_EXTRA_STACK_SIZE/16) "\n" + "pushw $0x00\n" // PMM allocation request + "lcallw *12(%%esp)\n" + "addl $16, %%esp\n" + "cli\n" + "cld\n" + : "+r" (entry.segoff), "=a" (res1), "=d" (res2) : : "cc", "memory"); + u32 res = res1 | (res2 << 16); + if (!res || res == PMM_FUNCTION_NOT_SUPPORTED) + return; + dprintf(1, "VGA stack allocated at %x\n", res); + SET_VGA(ExtraStackSeg, res >> 4); + extern void entry_10_extrastack(void); + SET_IVT(0x10, SEGOFF(get_global_seg(), (u32)entry_10_extrastack)); + return; + } +} + + +/**************************************************************** + * Timer hook + ****************************************************************/ + +struct segoff_s Timer_Hook_Resume VAR16 VISIBLE16; + +void VISIBLE16 +handle_timer_hook(void) +{ + if (!vga_emulate_text()) + return; + vgafb_set_swcursor(GET_BDA(timer_counter) % 18 < 9); +} + +static void +hook_timer_irq(void) +{ + if (!CONFIG_VGA_EMULATE_TEXT) + return; + extern void entry_timer_hook(void); + extern void entry_timer_hook_extrastack(void); + struct segoff_s oldirq = GET_IVT(0x08); + struct segoff_s newirq = SEGOFF(get_global_seg(), (u32)entry_timer_hook); + if (CONFIG_VGA_ALLOCATE_EXTRA_STACK && GET_GLOBAL(ExtraStackSeg)) + newirq = SEGOFF(get_global_seg(), (u32)entry_timer_hook_extrastack); + dprintf(1, "Hooking hardware timer irq (old=%x new=%x)\n" + , oldirq.segoff, newirq.segoff); + SET_VGA(Timer_Hook_Resume, oldirq); + SET_IVT(0x08, newirq); +} + + +/**************************************************************** + * VGA post + ****************************************************************/ + +static void +init_bios_area(void) +{ + // init detected hardware BIOS Area + // set 80x25 color (not clear from RBIL but usual) + set_equipment_flags(0x30, 0x20); + + // Set the basic modeset options + SET_BDA(modeset_ctl, 0x51); + + SET_BDA(dcc_index, CONFIG_VGA_STDVGA_PORTS ? 0x08 : 0xff); + SET_BDA(video_savetable + , SEGOFF(get_global_seg(), (u32)&video_save_pointer_table)); + + // FIXME + SET_BDA(video_msr, 0x00); // Unavailable on vanilla vga, but... + SET_BDA(video_pal, 0x00); // Unavailable on vanilla vga, but... +} + +int VgaBDF VAR16 = -1; +int HaveRunInit VAR16; + +void VISIBLE16 +vga_post(struct bregs *regs) +{ + serial_debug_preinit(); + dprintf(1, "Start SeaVGABIOS (version %s)\n", VERSION); + debug_enter(regs, DEBUG_VGA_POST); + + if (CONFIG_VGA_PCI && !GET_GLOBAL(HaveRunInit)) { + u16 bdf = regs->ax; + if ((pci_config_readw(bdf, PCI_VENDOR_ID) + == GET_GLOBAL(rom_pci_data.vendor)) + && (pci_config_readw(bdf, PCI_DEVICE_ID) + == GET_GLOBAL(rom_pci_data.device))) + SET_VGA(VgaBDF, bdf); + } + + int ret = vgahw_setup(); + if (ret) { + dprintf(1, "Failed to initialize VGA hardware. Exiting.\n"); + return; + } + + if (GET_GLOBAL(HaveRunInit)) + return; + + init_bios_area(); + + SET_VGA(video_save_pointer_table.videoparam + , SEGOFF(get_global_seg(), (u32)video_param_table)); + if (CONFIG_VGA_STDVGA_PORTS) + stdvga_build_video_param(); + + extern void entry_10(void); + SET_IVT(0x10, SEGOFF(get_global_seg(), (u32)entry_10)); + + allocate_extra_stack(); + + hook_timer_irq(); + + SET_VGA(HaveRunInit, 1); + + // Fixup checksum + extern u8 _rom_header_size, _rom_header_checksum; + SET_VGA(_rom_header_checksum, 0); + u8 sum = -checksum_far(get_global_seg(), 0, + GET_GLOBAL(_rom_header_size) * 512); + SET_VGA(_rom_header_checksum, sum); +} |