Messages in this thread Patch in this message | | | Subject | [PATCH 1/3: FBDEV: VGA State Save/Restore module | From | Antonino Daplas <> | Date | 04 Dec 2002 22:26:10 +0500 |
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Hi,
Attached is a patch against linux-2.5.50 + James Simmons fbdev.diff to save and restore the VGA state. This includes character maps (plane 0-3), the colormap, and the video mode. This can be used in fb_open() and fb_release() to go back to VGA text/graphics mode.
Usage:
struct fb_vgastate state;
/* To save VGA state */ state.flags = VGA_SAVE_MODE | VGA_SAVE_CMAP | VGA_SAVE_FONTS; fb_save_vga(&state);
/* To restore VGA state */ fb_restore_vga(&state);
Limitations: 1. Restoring the VGA state from high-resolution graphics mode may result in a corrupt display which can be corrected by switching consoles. May need a screen redraw at this point. Restoring from VGA graphics mode to text mode and vice versa is okay.
2. Assumes some things about the hardware which is not universally correct: VGA memory base is at 0xA0000, memory size is 64KB, the hardware palette is readable, etc.
Any comments welcome.
Tony
PS: Please reverse the early patch I submitted if it was applied -- vgastate.diff
diff -Naur linux-2.5.50-js/drivers/video/Makefile linux/drivers/video/Makefile --- linux-2.5.50-js/drivers/video/Makefile 2002-12-04 15:15:25.000000000 +0000 +++ linux/drivers/video/Makefile 2002-12-04 15:14:40.000000000 +0000 @@ -6,7 +6,7 @@ # This list comes from 'grep -l EXPORT_SYMBOL *.[hc]'. export-objs := fbmem.o fbcmap.o fbmon.o modedb.o softcursor.o cfbfillrect.o \ - cfbcopyarea.o cfbimgblt.o cyber2000fb.o + cfbcopyarea.o cfbimgblt.o cyber2000fb.o vgastate.o # Each configuration option enables a list of files. diff -Naur linux-2.5.50-js/drivers/video/vgastate.c linux/drivers/video/vgastate.c --- linux-2.5.50-js/drivers/video/vgastate.c 1970-01-01 00:00:00.000000000 +0000 +++ linux/drivers/video/vgastate.c 2002-12-04 15:14:17.000000000 +0000 @@ -0,0 +1,438 @@ +/* + * linux/include/video/vgastate.c -- VGA state save/restore + * + * Copyright 2002 James Simmons + * + * Copyright history from vga16fb.c: + * Copyright 1999 Ben Pfaff and Petr Vandrovec + * Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm + * Based on VESA framebuffer (c) 1998 Gerd Knorr + * + * This file is subject to the terms and conditions of the GNU General + * Public License. See the file COPYING in the main directory of this + * archive for more details. + * + */ +#include <linux/config.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/fb.h> + +#include "vga.h" + +static inline unsigned char vga_rcrtcs(caddr_t regbase, unsigned short iobase, + unsigned char reg) +{ + vga_w(regbase, iobase + 0x4, reg); + return vga_r(regbase, iobase + 0x5); +} + +static inline void vga_wcrtcs(caddr_t regbase, unsigned short iobase, + unsigned char reg, unsigned char val) +{ + vga_w(regbase, iobase + 0x4, reg); + vga_w(regbase, iobase + 0x5, val); +} + +static void save_vga_text(struct fb_vgastate *state) +{ + int i; + u8 misc, attr10, gr4, gr5, gr6, seq1, seq2, seq4; + + /* if in graphics mode, no need to save */ + attr10 = vga_rattr(state->vgabase, 0x10); + if (attr10 & 1) + return; + + /* save regs */ + misc = vga_r(state->vgabase, VGA_MIS_R); + gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ); + gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE); + gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC); + seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE); + seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE); + + /* force graphics mode */ + vga_w(state->vgabase, VGA_MIS_W, misc | 1); + + /* blank screen */ + seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE); + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5); + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3); + + /* save font 0 */ + if (state->flags & VGA_SAVE_FONT0) { + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2); + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); + for (i = 0; i < 8 * 8192; i++) + state->vga_font0[i] = vga_r(state->fbbase, i); + } + /* save font 1 */ + if (state->flags & VGA_SAVE_FONT1) { + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3); + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); + for (i = 0; i < 8 * 8192; i++) + state->vga_font1[i] = vga_r(state->fbbase, i); + } + /* save font 2 */ + if (state->flags & VGA_SAVE_TEXT) { + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); + for (i = 0; i < 2 * 8192; i++) + state->vga_text[i] = vga_r(state->fbbase, i); + + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1); + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); + for (i = 0; i < 2 * 8192; i++) + state->vga_text[i] = vga_r(state->fbbase + + 2 * 8192, i); + } + + /* restore regs */ + vga_wattr(state->vgabase, 0x10, attr10); + + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4); + + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4); + vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5); + vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6); + vga_w(state->vgabase, VGA_MIS_W, misc); + + /* unblank screen */ + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5)); + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3); + + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1); +} + +static void restore_vga_text(struct fb_vgastate *state) +{ + int i; + u8 misc, gr1, gr3, gr4, gr5, gr6, gr8; + u8 seq1, seq2, seq4; + + /* save regs */ + misc = vga_r(state->vgabase, VGA_MIS_R); + gr1 = vga_rgfx(state->vgabase, VGA_GFX_SR_ENABLE); + gr3 = vga_rgfx(state->vgabase, VGA_GFX_DATA_ROTATE); + gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ); + gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE); + gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC); + gr8 = vga_rgfx(state->vgabase, VGA_GFX_BIT_MASK); + seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE); + seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE); + + /* force graphics mode */ + vga_w(state->vgabase, VGA_MIS_W, misc | 1); + + /* blank screen */ + seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE); + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5); + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3); + + if (state->depth == 4) { + vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, 0xff); + vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, 0x00); + } + /* restore font 0 */ + if (state->flags & VGA_SAVE_FONT0) { + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2); + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); + for (i = 0; i < 8 * 8192; i++) + vga_w(state->fbbase, i, state->vga_font0[i]); + } + /* restore font 1 */ + if (state->flags & VGA_SAVE_FONT1) { + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3); + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); + for (i = 0; i < 8 * 8192; i++) + vga_w(state->fbbase, i, state->vga_font1[i]); + } + /* restore font 2 */ + if (state->flags & VGA_SAVE_TEXT) { + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); + for (i = 0; i < 2 * 8192; i++) + vga_w(state->fbbase, i, state->vga_text[i]); + + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1); + vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); + vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); + for (i = 0; i < 2 * 8192; i++) + vga_w(state->fbbase + 2 * 8192, i, + state->vga_text[i]); + } + /* unblank screen */ + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5)); + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3); + + /* restore regs */ + vga_w(state->vgabase, VGA_MIS_W, misc); + + vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, gr1); + vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, gr3); + vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4); + vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5); + vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6); + vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, gr8); + + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1); + vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2); + vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4); +} + +static void save_vga_mode(struct fb_vgastate *state) +{ + unsigned short iobase; + int i; + + state->misc = vga_r(state->vgabase, VGA_MIS_R); + if (state->misc & 1) + iobase = 0x3d0; + else + iobase = 0x3b0; + + for (i = 0; i < state->num_crtc; i++) + state->crtc[i] = vga_rcrtcs(state->vgabase, iobase, i); + + vga_r(state->vgabase, iobase + 0xa); + vga_w(state->vgabase, VGA_ATT_W, 0x00); + for (i = 0; i < state->num_attr; i++) { + vga_r(state->vgabase, iobase + 0xa); + state->attr[i] = vga_rattr(state->vgabase, i); + } + vga_r(state->vgabase, iobase + 0xa); + vga_w(state->vgabase, VGA_ATT_W, 0x20); + + for (i = 0; i < state->num_gfx; i++) + state->gfx[i] = vga_rgfx(state->vgabase, i); + + for (i = 0; i < state->num_seq; i++) + state->seq[i] = vga_rseq(state->vgabase, i); +} + +static void restore_vga_mode(struct fb_vgastate *state) +{ + unsigned short iobase; + int i; + + vga_w(state->vgabase, VGA_MIS_W, state->misc); + + if (state->misc & 1) + iobase = 0x3d0; + else + iobase = 0x3b0; + + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01); + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, + state->seq[VGA_SEQ_CLOCK_MODE] | 0x20); + + for (i = 2; i < state->num_seq; i++) + vga_wseq(state->vgabase, i, state->seq[i]); + + vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03); + + /* unprotect vga regs */ + vga_wcrtcs(state->vgabase, iobase, 17, state->crtc[17] & ~0x80); + for (i = 0; i < state->num_crtc; i++) + vga_wcrtcs(state->vgabase, iobase, i, state->crtc[i]); + + for (i = 0; i < state->num_gfx; i++) + vga_wgfx(state->vgabase, i, state->gfx[i]); + + vga_r(state->vgabase, iobase + 0xa); + vga_w(state->vgabase, VGA_ATT_W, 0x00); + for (i = 0; i < state->num_attr; i++) { + vga_r(state->vgabase, iobase + 0xa); + vga_wattr(state->vgabase, i, state->attr[i]); + } + + vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, + state->seq[VGA_SEQ_CLOCK_MODE]); + + vga_r(state->vgabase, iobase + 0xa); + vga_w(state->vgabase, VGA_ATT_W, 0x20); +} + +static void save_vga_cmap(struct fb_vgastate *state) +{ + int i; + + vga_w(state->vgabase, VGA_PEL_MSK, 0xff); + + /* assumes DAC is readable and writable */ + vga_w(state->vgabase, VGA_PEL_IR, 0x00); + for (i = 0; i < 768; i++) + state->vga_cmap[i] = vga_r(state->vgabase, VGA_PEL_D); +} + +static void restore_vga_cmap(struct fb_vgastate *state) +{ + int i; + + vga_w(state->vgabase, VGA_PEL_MSK, 0xff); + + vga_w(state->vgabase, VGA_PEL_IW, 0x00); + for (i = 0; i < 768; i++) + vga_w(state->vgabase, VGA_PEL_D, state->vga_cmap[i]); +} + +static void vga_cleanup(struct fb_vgastate *state) +{ + if (state->vga_font0) + kfree(state->vga_font0); + if (state->vga_font1) + kfree(state->vga_font1); + if (state->vga_text) + kfree(state->vga_text); + if (state->fbbase) + iounmap(state->fbbase); + if (state->vga_cmap) + kfree(state->vga_cmap); + if (state->attr) + kfree(state->attr); + if (state->crtc) + kfree(state->crtc); + if (state->gfx) + kfree(state->gfx); + if (state->seq) + kfree(state->seq); +} + +int fb_save_vga(struct fb_vgastate *state) +{ + state->vga_font0 = NULL; + state->vga_font1 = NULL; + state->vga_text = NULL; + state->vga_cmap = NULL; + state->attr = NULL; + state->crtc = NULL; + state->gfx = NULL; + state->seq = NULL; + + if (state->flags & VGA_SAVE_CMAP) { + state->vga_cmap = kmalloc(768, GFP_KERNEL); + if (!state->vga_cmap) { + vga_cleanup(state); + return 1; + } + save_vga_cmap(state); + } + + if (state->flags & VGA_SAVE_MODE) { + if (state->num_attr < 21) + state->num_attr = 21; + if (state->num_crtc < 25) + state->num_crtc = 25; + if (state->num_gfx < 9) + state->num_gfx = 9; + if (state->num_seq < 5) + state->num_seq = 5; + state->attr = kmalloc(state->num_attr, GFP_KERNEL); + state->crtc = kmalloc(state->num_crtc, GFP_KERNEL); + state->gfx = kmalloc(state->num_gfx, GFP_KERNEL); + state->seq = kmalloc(state->num_seq, GFP_KERNEL); + if (!state->attr || !state->crtc || !state->gfx || + !state->seq) { + vga_cleanup(state); + return 1; + } + save_vga_mode(state); + } + + if (state->flags & VGA_SAVE_FONT0) { + state->vga_font0 = kmalloc(8192 * 8, GFP_KERNEL); + if (!state->vga_font0) { + vga_cleanup(state); + return 1; + } + } + if (state->flags & VGA_SAVE_FONT1) { + state->vga_font1 = kmalloc(8192 * 8, GFP_KERNEL); + if (!state->vga_font1) { + vga_cleanup(state); + return 1; + } + } + if (state->flags & VGA_SAVE_TEXT) { + state->vga_text = kmalloc(8192 * 4, GFP_KERNEL); + if (!state->vga_text) { + vga_cleanup(state); + return 1; + } + } + if (state->flags & VGA_SAVE_FONTS) { + state->fbbase = ioremap(0xA0000, 8 * 8192); + if (!state->fbbase) { + vga_cleanup(state); + return 1; + } + save_vga_text(state); + iounmap(state->fbbase); + state->fbbase = NULL; + } + return 0; +} + +int fb_restore_vga (struct fb_vgastate *state) +{ + if (state->flags & VGA_SAVE_MODE) + restore_vga_mode(state); + + if (state->flags & VGA_SAVE_FONTS) { + state->fbbase = ioremap(0xA0000, 8 * 8192); + if (!state->fbbase) { + vga_cleanup(state); + return 1; + } + restore_vga_text(state); + } + + if (state->flags & VGA_SAVE_CMAP) + restore_vga_cmap(state); + + vga_cleanup(state); + return 0; +} + +#ifdef MODULE +int init_module(void) { return 0; }; +void cleanup_module(void) {}; +#endif + +EXPORT_SYMBOL(fb_save_vga); +EXPORT_SYMBOL(fb_restore_vga); + +MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>"); +MODULE_DESCRIPTION("VGA State Save/Restore"); +MODULE_LICENSE("GPL"); + diff -Naur linux-2.5.50-js/include/linux/fb.h linux/include/linux/fb.h --- linux-2.5.50-js/include/linux/fb.h 2002-12-04 15:07:13.000000000 +0000 +++ linux/include/linux/fb.h 2002-12-04 15:20:00.000000000 +0000 @@ -321,6 +321,37 @@ struct fb_image image; /* Cursor image */ }; +/* VGA State Save and Restore */ +#define VGA_SAVE_FONT0 1 /* save/restore plane 2 fonts */ +#define VGA_SAVE_FONT1 2 /* save/restore plane 3 fonts */ +#define VGA_SAVE_TEXT 4 /* save/restore plane 0/1 fonts */ +#define VGA_SAVE_FONTS 7 /* save/restore all fonts */ +#define VGA_SAVE_MODE 8 /* save/restore video mode */ +#define VGA_SAVE_CMAP 16 /* save/restore color map/DAC */ + +struct fb_vgastate { + caddr_t vgabase; /* mmio base, if supported */ + __u32 flags; /* what state/s to save (see VGA_SAVE_*) */ + __u32 depth; /* current fb depth, not important */ + __u32 num_attr; /* number of att registers, 0 for default */ + __u32 num_crtc; /* number of crt registers, 0 for default */ + __u32 num_gfx; /* number of gfx registers, 0 for default */ + __u32 num_seq; /* number of seq registers, 0 for default */ + caddr_t fbbase; /* -- DO NOT ALTER STARTING HERE -- */ + __u8 *vga_font0; + __u8 *vga_font1; + __u8 *vga_text; + __u8 *vga_cmap; + __u8 *attr; + __u8 *crtc; + __u8 *gfx; + __u8 *seq; + __u8 misc; +}; + +extern int fb_save_vga(struct fb_vgastate *state); +extern int fb_restore_vga(struct fb_vgastate *state); + #ifdef __KERNEL__ #include <linux/fs.h> | |