X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=vgasrc%2Fbochsvga.c;h=0a36afc5f3a11389807bf93b0f2a5d00ceff16d4;hb=e737b178e1232c4bec4bd5da721806a9dc176e15;hp=82629b9f23cb3cfbf99336cc0578044c50268a10;hpb=b3df857fe6d3fffb108379637ea4a456ce6e09ba;p=seabios.git diff --git a/vgasrc/bochsvga.c b/vgasrc/bochsvga.c index 82629b9..0a36afc 100644 --- a/vgasrc/bochsvga.c +++ b/vgasrc/bochsvga.c @@ -1,229 +1,221 @@ +// Bochs VGA interface to extended "VBE" modes +// +// Copyright (C) 2012 Kevin O'Connor +// Copyright (C) 2011 Julian Pidancet +// Copyright (C) 2002 Jeroen Janssen +// +// This file may be distributed under the terms of the GNU LGPLv3 license. + #include "vgabios.h" // struct vbe_modeinfo -#include "vbe.h" // VBE_MODE_VESA_DEFINED +#include "vbe.h" // VBE_CAPABILITY_8BIT_DAC #include "bochsvga.h" // bochsvga_set_mode #include "util.h" // dprintf #include "config.h" // CONFIG_* -#include "biosvar.h" // SET_BDA +#include "biosvar.h" // GET_GLOBAL #include "stdvga.h" // VGAREG_SEQU_ADDRESS #include "pci.h" // pci_config_readl #include "pci_regs.h" // PCI_BASE_ADDRESS_0 + +/**************************************************************** + * Mode tables + ****************************************************************/ + static struct bochsvga_mode { u16 mode; struct vgamode_s info; } bochsvga_modes[] VAR16 = { /* standard modes */ - { 0x100, { MM_PACKED, 640, 400, 8 } }, - { 0x101, { MM_PACKED, 640, 480, 8 } }, - { 0x102, { MM_PLANAR, 800, 600, 4 } }, - { 0x103, { MM_PACKED, 800, 600, 8 } }, - { 0x104, { MM_PLANAR, 1024, 768, 4 } }, - { 0x105, { MM_PACKED, 1024, 768, 8 } }, - { 0x106, { MM_PLANAR, 1280, 1024, 4 } }, - { 0x107, { MM_PACKED, 1280, 1024, 8 } }, - { 0x10D, { MM_DIRECT, 320, 200, 15 } }, - { 0x10E, { MM_DIRECT, 320, 200, 16 } }, - { 0x10F, { MM_DIRECT, 320, 200, 24 } }, - { 0x110, { MM_DIRECT, 640, 480, 15 } }, - { 0x111, { MM_DIRECT, 640, 480, 16 } }, - { 0x112, { MM_DIRECT, 640, 480, 24 } }, - { 0x113, { MM_DIRECT, 800, 600, 15 } }, - { 0x114, { MM_DIRECT, 800, 600, 16 } }, - { 0x115, { MM_DIRECT, 800, 600, 24 } }, - { 0x116, { MM_DIRECT, 1024, 768, 15 } }, - { 0x117, { MM_DIRECT, 1024, 768, 16 } }, - { 0x118, { MM_DIRECT, 1024, 768, 24 } }, - { 0x119, { MM_DIRECT, 1280, 1024, 15 } }, - { 0x11A, { MM_DIRECT, 1280, 1024, 16 } }, - { 0x11B, { MM_DIRECT, 1280, 1024, 24 } }, - { 0x11C, { MM_PACKED, 1600, 1200, 8 } }, - { 0x11D, { MM_DIRECT, 1600, 1200, 15 } }, - { 0x11E, { MM_DIRECT, 1600, 1200, 16 } }, - { 0x11F, { MM_DIRECT, 1600, 1200, 24 } }, + { 0x100, { MM_PACKED, 640, 400, 8, 8, 16, SEG_GRAPH } }, + { 0x101, { MM_PACKED, 640, 480, 8, 8, 16, SEG_GRAPH } }, + { 0x102, { MM_PLANAR, 800, 600, 4, 8, 16, SEG_GRAPH } }, + { 0x103, { MM_PACKED, 800, 600, 8, 8, 16, SEG_GRAPH } }, + { 0x104, { MM_PLANAR, 1024, 768, 4, 8, 16, SEG_GRAPH } }, + { 0x105, { MM_PACKED, 1024, 768, 8, 8, 16, SEG_GRAPH } }, + { 0x106, { MM_PLANAR, 1280, 1024, 4, 8, 16, SEG_GRAPH } }, + { 0x107, { MM_PACKED, 1280, 1024, 8, 8, 16, SEG_GRAPH } }, + { 0x10D, { MM_DIRECT, 320, 200, 15, 8, 16, SEG_GRAPH } }, + { 0x10E, { MM_DIRECT, 320, 200, 16, 8, 16, SEG_GRAPH } }, + { 0x10F, { MM_DIRECT, 320, 200, 24, 8, 16, SEG_GRAPH } }, + { 0x110, { MM_DIRECT, 640, 480, 15, 8, 16, SEG_GRAPH } }, + { 0x111, { MM_DIRECT, 640, 480, 16, 8, 16, SEG_GRAPH } }, + { 0x112, { MM_DIRECT, 640, 480, 24, 8, 16, SEG_GRAPH } }, + { 0x113, { MM_DIRECT, 800, 600, 15, 8, 16, SEG_GRAPH } }, + { 0x114, { MM_DIRECT, 800, 600, 16, 8, 16, SEG_GRAPH } }, + { 0x115, { MM_DIRECT, 800, 600, 24, 8, 16, SEG_GRAPH } }, + { 0x116, { MM_DIRECT, 1024, 768, 15, 8, 16, SEG_GRAPH } }, + { 0x117, { MM_DIRECT, 1024, 768, 16, 8, 16, SEG_GRAPH } }, + { 0x118, { MM_DIRECT, 1024, 768, 24, 8, 16, SEG_GRAPH } }, + { 0x119, { MM_DIRECT, 1280, 1024, 15, 8, 16, SEG_GRAPH } }, + { 0x11A, { MM_DIRECT, 1280, 1024, 16, 8, 16, SEG_GRAPH } }, + { 0x11B, { MM_DIRECT, 1280, 1024, 24, 8, 16, SEG_GRAPH } }, + { 0x11C, { MM_PACKED, 1600, 1200, 8, 8, 16, SEG_GRAPH } }, + { 0x11D, { MM_DIRECT, 1600, 1200, 15, 8, 16, SEG_GRAPH } }, + { 0x11E, { MM_DIRECT, 1600, 1200, 16, 8, 16, SEG_GRAPH } }, + { 0x11F, { MM_DIRECT, 1600, 1200, 24, 8, 16, SEG_GRAPH } }, /* BOCHS modes */ - { 0x140, { MM_DIRECT, 320, 200, 32 } }, - { 0x141, { MM_DIRECT, 640, 400, 32 } }, - { 0x142, { MM_DIRECT, 640, 480, 32 } }, - { 0x143, { MM_DIRECT, 800, 600, 32 } }, - { 0x144, { MM_DIRECT, 1024, 768, 32 } }, - { 0x145, { MM_DIRECT, 1280, 1024, 32 } }, - { 0x146, { MM_PACKED, 320, 200, 8 } }, - { 0x147, { MM_DIRECT, 1600, 1200, 32 } }, - { 0x148, { MM_PACKED, 1152, 864, 8 } }, - { 0x149, { MM_DIRECT, 1152, 864, 15 } }, - { 0x14a, { MM_DIRECT, 1152, 864, 16 } }, - { 0x14b, { MM_DIRECT, 1152, 864, 24 } }, - { 0x14c, { MM_DIRECT, 1152, 864, 32 } }, - { 0x178, { MM_DIRECT, 1280, 800, 16 } }, - { 0x179, { MM_DIRECT, 1280, 800, 24 } }, - { 0x17a, { MM_DIRECT, 1280, 800, 32 } }, - { 0x17b, { MM_DIRECT, 1280, 960, 16 } }, - { 0x17c, { MM_DIRECT, 1280, 960, 24 } }, - { 0x17d, { MM_DIRECT, 1280, 960, 32 } }, - { 0x17e, { MM_DIRECT, 1440, 900, 16 } }, - { 0x17f, { MM_DIRECT, 1440, 900, 24 } }, - { 0x180, { MM_DIRECT, 1440, 900, 32 } }, - { 0x181, { MM_DIRECT, 1400, 1050, 16 } }, - { 0x182, { MM_DIRECT, 1400, 1050, 24 } }, - { 0x183, { MM_DIRECT, 1400, 1050, 32 } }, - { 0x184, { MM_DIRECT, 1680, 1050, 16 } }, - { 0x185, { MM_DIRECT, 1680, 1050, 24 } }, - { 0x186, { MM_DIRECT, 1680, 1050, 32 } }, - { 0x187, { MM_DIRECT, 1920, 1200, 16 } }, - { 0x188, { MM_DIRECT, 1920, 1200, 24 } }, - { 0x189, { MM_DIRECT, 1920, 1200, 32 } }, - { 0x18a, { MM_DIRECT, 2560, 1600, 16 } }, - { 0x18b, { MM_DIRECT, 2560, 1600, 24 } }, - { 0x18c, { MM_DIRECT, 2560, 1600, 32 } }, + { 0x140, { MM_DIRECT, 320, 200, 32, 8, 16, SEG_GRAPH } }, + { 0x141, { MM_DIRECT, 640, 400, 32, 8, 16, SEG_GRAPH } }, + { 0x142, { MM_DIRECT, 640, 480, 32, 8, 16, SEG_GRAPH } }, + { 0x143, { MM_DIRECT, 800, 600, 32, 8, 16, SEG_GRAPH } }, + { 0x144, { MM_DIRECT, 1024, 768, 32, 8, 16, SEG_GRAPH } }, + { 0x145, { MM_DIRECT, 1280, 1024, 32, 8, 16, SEG_GRAPH } }, + { 0x146, { MM_PACKED, 320, 200, 8, 8, 16, SEG_GRAPH } }, + { 0x147, { MM_DIRECT, 1600, 1200, 32, 8, 16, SEG_GRAPH } }, + { 0x148, { MM_PACKED, 1152, 864, 8, 8, 16, SEG_GRAPH } }, + { 0x149, { MM_DIRECT, 1152, 864, 15, 8, 16, SEG_GRAPH } }, + { 0x14a, { MM_DIRECT, 1152, 864, 16, 8, 16, SEG_GRAPH } }, + { 0x14b, { MM_DIRECT, 1152, 864, 24, 8, 16, SEG_GRAPH } }, + { 0x14c, { MM_DIRECT, 1152, 864, 32, 8, 16, SEG_GRAPH } }, + { 0x178, { MM_DIRECT, 1280, 800, 16, 8, 16, SEG_GRAPH } }, + { 0x179, { MM_DIRECT, 1280, 800, 24, 8, 16, SEG_GRAPH } }, + { 0x17a, { MM_DIRECT, 1280, 800, 32, 8, 16, SEG_GRAPH } }, + { 0x17b, { MM_DIRECT, 1280, 960, 16, 8, 16, SEG_GRAPH } }, + { 0x17c, { MM_DIRECT, 1280, 960, 24, 8, 16, SEG_GRAPH } }, + { 0x17d, { MM_DIRECT, 1280, 960, 32, 8, 16, SEG_GRAPH } }, + { 0x17e, { MM_DIRECT, 1440, 900, 16, 8, 16, SEG_GRAPH } }, + { 0x17f, { MM_DIRECT, 1440, 900, 24, 8, 16, SEG_GRAPH } }, + { 0x180, { MM_DIRECT, 1440, 900, 32, 8, 16, SEG_GRAPH } }, + { 0x181, { MM_DIRECT, 1400, 1050, 16, 8, 16, SEG_GRAPH } }, + { 0x182, { MM_DIRECT, 1400, 1050, 24, 8, 16, SEG_GRAPH } }, + { 0x183, { MM_DIRECT, 1400, 1050, 32, 8, 16, SEG_GRAPH } }, + { 0x184, { MM_DIRECT, 1680, 1050, 16, 8, 16, SEG_GRAPH } }, + { 0x185, { MM_DIRECT, 1680, 1050, 24, 8, 16, SEG_GRAPH } }, + { 0x186, { MM_DIRECT, 1680, 1050, 32, 8, 16, SEG_GRAPH } }, + { 0x187, { MM_DIRECT, 1920, 1200, 16, 8, 16, SEG_GRAPH } }, + { 0x188, { MM_DIRECT, 1920, 1200, 24, 8, 16, SEG_GRAPH } }, + { 0x189, { MM_DIRECT, 1920, 1200, 32, 8, 16, SEG_GRAPH } }, + { 0x18a, { MM_DIRECT, 2560, 1600, 16, 8, 16, SEG_GRAPH } }, + { 0x18b, { MM_DIRECT, 2560, 1600, 24, 8, 16, SEG_GRAPH } }, + { 0x18c, { MM_DIRECT, 2560, 1600, 32, 8, 16, SEG_GRAPH } }, }; -static u16 dispi_get_max_xres(void) +static int is_bochsvga_mode(struct vgamode_s *vmode_g) { - u16 en; - u16 xres; - - en = dispi_read(VBE_DISPI_INDEX_ENABLE); - - dispi_write(VBE_DISPI_INDEX_ENABLE, en | VBE_DISPI_GETCAPS); - xres = dispi_read(VBE_DISPI_INDEX_XRES); - dispi_write(VBE_DISPI_INDEX_ENABLE, en); + return (vmode_g >= &bochsvga_modes[0].info + && vmode_g <= &bochsvga_modes[ARRAY_SIZE(bochsvga_modes)-1].info); +} - return xres; +struct vgamode_s *bochsvga_find_mode(int mode) +{ + struct bochsvga_mode *m = bochsvga_modes; + for (; m < &bochsvga_modes[ARRAY_SIZE(bochsvga_modes)]; m++) + if (GET_GLOBAL(m->mode) == mode) + return &m->info; + return stdvga_find_mode(mode); } -static u16 dispi_get_max_bpp(void) +void +bochsvga_list_modes(u16 seg, u16 *dest, u16 *last) { - u16 en; - u16 bpp; + struct bochsvga_mode *m = bochsvga_modes; + for (; m < &bochsvga_modes[ARRAY_SIZE(bochsvga_modes)] && destmode); + if (mode == 0xffff) + continue; + SET_FARVAR(seg, *dest, mode); + dest++; + } + stdvga_list_modes(seg, dest, last); +} - en = dispi_read(VBE_DISPI_INDEX_ENABLE); - dispi_write(VBE_DISPI_INDEX_ENABLE, en | VBE_DISPI_GETCAPS); - bpp = dispi_read(VBE_DISPI_INDEX_BPP); - dispi_write(VBE_DISPI_INDEX_ENABLE, en); +/**************************************************************** + * Helper functions + ****************************************************************/ - return bpp; +int +bochsvga_get_window(struct vgamode_s *vmode_g, int window) +{ + if (window != 0) + return -1; + return dispi_read(VBE_DISPI_INDEX_BANK); } -/* Called only during POST */ int -bochsvga_init(void) +bochsvga_set_window(struct vgamode_s *vmode_g, int window, int val) { - int ret = stdvga_init(); - if (ret) - return ret; - - /* Sanity checks */ - dispi_write(VBE_DISPI_INDEX_ID, VBE_DISPI_ID0); - if (dispi_read(VBE_DISPI_INDEX_ID) != VBE_DISPI_ID0) { - dprintf(1, "No VBE DISPI interface detected\n"); + if (window != 0) + return -1; + dispi_write(VBE_DISPI_INDEX_BANK, val); + if (dispi_read(VBE_DISPI_INDEX_BANK) != val) return -1; - } - - dispi_write(VBE_DISPI_INDEX_ID, VBE_DISPI_ID5); - - u32 lfb_addr; - if (CONFIG_VGA_PCI) - lfb_addr = (pci_config_readl(GET_GLOBAL(VgaBDF), PCI_BASE_ADDRESS_0) - & PCI_BASE_ADDRESS_MEM_MASK); - else - lfb_addr = VBE_DISPI_LFB_PHYSICAL_ADDRESS; - - SET_VGA(VBE_framebuffer, lfb_addr); - u16 totalmem = dispi_read(VBE_DISPI_INDEX_VIDEO_MEMORY_64K); - SET_VGA(VBE_total_memory, totalmem * 64 * 1024); - SET_VGA(VBE_capabilities, VBE_CAPABILITY_8BIT_DAC); - - dprintf(1, "VBE DISPI detected. lfb_addr=%x\n", lfb_addr); - return 0; } -static int mode_valid(struct vgamode_s *vmode_g) +int +bochsvga_get_linelength(struct vgamode_s *vmode_g) { - u16 max_xres = dispi_get_max_xres(); - u16 max_bpp = dispi_get_max_bpp(); - u32 max_mem = GET_GLOBAL(VBE_total_memory); - - u16 width = GET_GLOBAL(vmode_g->width); - u16 height = GET_GLOBAL(vmode_g->height); - u8 depth = GET_GLOBAL(vmode_g->depth); - u32 mem = width * height * DIV_ROUND_UP(depth, 8); - - return width <= max_xres && depth <= max_bpp && mem <= max_mem; + return dispi_read(VBE_DISPI_INDEX_VIRT_WIDTH) * vga_bpp(vmode_g) / 8; } -struct vgamode_s *bochsvga_find_mode(int mode) +int +bochsvga_set_linelength(struct vgamode_s *vmode_g, int val) { - struct bochsvga_mode *m = bochsvga_modes; - for (; m < &bochsvga_modes[ARRAY_SIZE(bochsvga_modes)]; m++) - if (GET_GLOBAL(m->mode) == mode) { - if (! mode_valid(&m->info)) - return NULL; - return &m->info; - } - return stdvga_find_mode(mode); + stdvga_set_linelength(vmode_g, val); + int pixels = (val * 8) / vga_bpp(vmode_g); + dispi_write(VBE_DISPI_INDEX_VIRT_WIDTH, pixels); + return 0; } -void -bochsvga_list_modes(u16 seg, u16 *dest, u16 *last) +int +bochsvga_get_displaystart(struct vgamode_s *vmode_g) { - struct bochsvga_mode *m = bochsvga_modes; - for (; m < &bochsvga_modes[ARRAY_SIZE(bochsvga_modes)] && destinfo)) - continue; - - dprintf(1, "VBE found mode %x valid.\n", GET_GLOBAL(m->mode)); - SET_FARVAR(seg, *dest, GET_GLOBAL(m->mode)); - dest++; - } - - stdvga_list_modes(seg, dest, last); + int bpp = vga_bpp(vmode_g); + int linelength = dispi_read(VBE_DISPI_INDEX_VIRT_WIDTH) * bpp / 8; + int x = dispi_read(VBE_DISPI_INDEX_X_OFFSET); + int y = dispi_read(VBE_DISPI_INDEX_Y_OFFSET); + return x * bpp / 8 + linelength * y; } -static void -bochsvga_hires_enable(int enable) +int +bochsvga_set_displaystart(struct vgamode_s *vmode_g, int val) { - u16 flags = enable ? - VBE_DISPI_ENABLED | - VBE_DISPI_LFB_ENABLED | - VBE_DISPI_NOCLEARMEM : 0; - - dispi_write(VBE_DISPI_INDEX_ENABLE, flags); + stdvga_set_displaystart(vmode_g, val); + int bpp = vga_bpp(vmode_g); + int linelength = dispi_read(VBE_DISPI_INDEX_VIRT_WIDTH) * bpp / 8; + dispi_write(VBE_DISPI_INDEX_X_OFFSET, (val % linelength) * 8 / bpp); + dispi_write(VBE_DISPI_INDEX_Y_OFFSET, val / linelength); + return 0; } -static void -bochsvga_clear_scr(void) +int +bochsvga_get_dacformat(struct vgamode_s *vmode_g) { - u16 en; - - en = dispi_read(VBE_DISPI_INDEX_ENABLE); - en &= ~VBE_DISPI_NOCLEARMEM; - dispi_write(VBE_DISPI_INDEX_ENABLE, en); + u16 en = dispi_read(VBE_DISPI_INDEX_ENABLE); + return (en & VBE_DISPI_8BIT_DAC) ? 8 : 6; } int -bochsvga_set_mode(int mode, int flags) +bochsvga_set_dacformat(struct vgamode_s *vmode_g, int val) { - if (!(mode & VBE_MODE_VESA_DEFINED)) { - dprintf(1, "set VGA mode %x\n", mode); + u16 en = dispi_read(VBE_DISPI_INDEX_ENABLE); + if (val == 6) + en &= ~VBE_DISPI_8BIT_DAC; + else if (val == 8) + en |= VBE_DISPI_8BIT_DAC; + else + return -1; + dispi_write(VBE_DISPI_INDEX_ENABLE, en); + return 0; +} - SET_BDA(vbe_mode, 0); - bochsvga_hires_enable(0); - return stdvga_set_mode(mode, flags); - } - struct vgamode_s *vmode_g = bochsvga_find_mode(mode); - if (!vmode_g) { - dprintf(1, "VBE mode %x not found\n", mode); - return VBE_RETURN_STATUS_FAILED; - } - bochsvga_hires_enable(1); +/**************************************************************** + * Mode setting + ****************************************************************/ + +int +bochsvga_set_mode(struct vgamode_s *vmode_g, int flags) +{ + dispi_write(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_DISABLED); + if (! is_bochsvga_mode(vmode_g)) + return stdvga_set_mode(vmode_g, flags); u8 depth = GET_GLOBAL(vmode_g->depth); if (depth == 4) - stdvga_set_mode(0x6a, 0); + stdvga_set_mode(stdvga_find_mode(0x6a), 0); if (depth == 8) // XXX load_dac_palette(3); ; @@ -234,13 +226,15 @@ bochsvga_set_mode(int mode, int flags) dispi_write(VBE_DISPI_INDEX_XRES, width); dispi_write(VBE_DISPI_INDEX_YRES, height); dispi_write(VBE_DISPI_INDEX_BANK, 0); + u16 bf = ((flags & MF_NOCLEARMEM ? VBE_DISPI_NOCLEARMEM : 0) + | (flags & MF_LINEARFB ? VBE_DISPI_LFB_ENABLED : 0)); + dispi_write(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | bf); /* VGA compat setup */ - //XXX: This probably needs some reverse engineering u16 crtc_addr = VGAREG_VGA_CRTC_ADDRESS; stdvga_crtc_write(crtc_addr, 0x11, 0x00); stdvga_crtc_write(crtc_addr, 0x01, width / 8 - 1); - dispi_write(VBE_DISPI_INDEX_VIRT_WIDTH, width); + stdvga_set_linelength(vmode_g, width); stdvga_crtc_write(crtc_addr, 0x12, height - 1); u8 v = 0; if ((height - 1) & 0x0100) @@ -261,14 +255,73 @@ bochsvga_set_mode(int mode, int flags) stdvga_grdc_mask(0x05, 0x20, 0x40); } - SET_BDA(vbe_mode, mode | flags); + return 0; +} + - if (flags & MF_LINEARFB) { - /* Linear frame buffer */ - /* XXX: ??? */ +/**************************************************************** + * Init + ****************************************************************/ + +int +bochsvga_init(void) +{ + int ret = stdvga_init(); + if (ret) + return ret; + + /* Sanity checks */ + dispi_write(VBE_DISPI_INDEX_ID, VBE_DISPI_ID0); + if (dispi_read(VBE_DISPI_INDEX_ID) != VBE_DISPI_ID0) { + dprintf(1, "No VBE DISPI interface detected\n"); + return -1; } - if (!(mode & MF_NOCLEARMEM)) { - bochsvga_clear_scr(); + + dispi_write(VBE_DISPI_INDEX_ID, VBE_DISPI_ID5); + + if (GET_GLOBAL(HaveRunInit)) + return 0; + + u32 lfb_addr = VBE_DISPI_LFB_PHYSICAL_ADDRESS; + int bdf = GET_GLOBAL(VgaBDF); + if (CONFIG_VGA_PCI && bdf >= 0) { + int barid = 0; + u32 bar = pci_config_readl(bdf, PCI_BASE_ADDRESS_0); + if ((bar & PCI_BASE_ADDRESS_SPACE) != PCI_BASE_ADDRESS_SPACE_MEMORY) { + barid = 1; + bar = pci_config_readl(bdf, PCI_BASE_ADDRESS_1); + } + lfb_addr = bar & PCI_BASE_ADDRESS_MEM_MASK; + dprintf(1, "VBE DISPI: bdf %02x:%02x.%x, bar %d\n", pci_bdf_to_bus(bdf) + , pci_bdf_to_dev(bdf), pci_bdf_to_fn(bdf), barid); + } + + SET_VGA(VBE_framebuffer, lfb_addr); + u32 totalmem = dispi_read(VBE_DISPI_INDEX_VIDEO_MEMORY_64K) * 64 * 1024; + SET_VGA(VBE_total_memory, totalmem); + SET_VGA(VBE_capabilities, VBE_CAPABILITY_8BIT_DAC); + + dprintf(1, "VBE DISPI: lfb_addr=%x, size %d MB\n", + lfb_addr, totalmem / 16); + + // Validate modes + u16 en = dispi_read(VBE_DISPI_INDEX_ENABLE); + dispi_write(VBE_DISPI_INDEX_ENABLE, en | VBE_DISPI_GETCAPS); + u16 max_xres = dispi_read(VBE_DISPI_INDEX_XRES); + u16 max_bpp = dispi_read(VBE_DISPI_INDEX_BPP); + dispi_write(VBE_DISPI_INDEX_ENABLE, en); + struct bochsvga_mode *m = bochsvga_modes; + for (; m < &bochsvga_modes[ARRAY_SIZE(bochsvga_modes)]; m++) { + u16 width = GET_GLOBAL(m->info.width); + u16 height = GET_GLOBAL(m->info.height); + u8 depth = GET_GLOBAL(m->info.depth); + u32 mem = (height * DIV_ROUND_UP(width * vga_bpp(&m->info), 8) + * 4 / stdvga_bpp_factor(&m->info)); + + if (width > max_xres || depth > max_bpp || mem > totalmem) { + dprintf(1, "Removing mode %x\n", GET_GLOBAL(m->mode)); + SET_VGA(m->mode, 0xffff); + } } return 0;