+++ /dev/null
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <dos.h>
-#include "app.h"
-#include "cdpmi.h"
-#include "gfx.h"
-#include "vbe.h"
-#include "vga.h"
-#include "util.h"
-#include "cpuid.h"
-#include "logger.h"
-
-#ifdef __DJGPP__
-#define VMEM_PTR ((void*)(0xa0000 + __djgpp_conventional_base))
-#else
-#define VMEM_PTR ((void*)0xa0000)
-#endif
-
-#define SAME_BPP(a, b) \
- ((a) == (b) || ((a) == 16 && (b) == 15) || ((a) == 15 && (b) == 16) || \
- ((a) == 32 && (b) == 24) || ((a) == 24 && (b) == 32))
-
-void (*blit_frame)(void*, int);
-
-static void blit_frame_lfb(void *pixels, int vsync);
-static void blit_frame_banked(void *pixels, int vsync);
-static uint32_t calc_mask(int sz, int pos);
-
-static void enable_wrcomb(uint32_t addr, int len);
-static const char *mtrr_type_name(int type);
-static void print_mtrr(void);
-
-static struct video_mode *vmodes;
-static int num_vmodes;
-
-static int vbe_init_ver;
-static struct vbe_info vbe;
-
-/* current mode */
-static struct video_mode *curmode;
-static void *vpgaddr[2];
-static int frontidx, backidx;
-static int pgcount, pgsize, fbsize;
-
-
-int init_video(void)
-{
- int i, num, max_modes;
- struct video_mode *vmptr;
-
- if(vbe_info(&vbe) == -1) {
- errormsg("failed to retrieve VBE information\n");
- return -1;
- }
- vbe_print_info(stdout, &vbe);
-
- num_vmodes = 0;
- max_modes = 64;
- if(!(vmodes = malloc(max_modes * sizeof *vmodes))) {
- errormsg("failed to allocate video modes list\n");
- return -1;
- }
-
- num = vbe_num_modes(&vbe);
- for(i=0; i<num; i++) {
- struct vbe_mode_info minf;
-
- if(vbe_mode_info(vbe.modes[i], &minf) == -1) {
- continue;
- }
-
- if(num_vmodes >= max_modes) {
- int newmax = max_modes ? (max_modes << 1) : 16;
- if(!(vmptr = realloc(vmodes, newmax * sizeof *vmodes))) {
- errormsg("failed to grow video mode list (%d)\n", newmax);
- free(vmodes);
- return -1;
- }
- vmodes = vmptr;
- max_modes = newmax;
- }
-
- vmptr = vmodes + num_vmodes++;
- memset(vmptr, 0, sizeof *vmptr);
- vmptr->mode = vbe.modes[i];
- vmptr->xsz = minf.xres;
- vmptr->ysz = minf.yres;
- vmptr->bpp = minf.bpp;
- vmptr->pitch = minf.scanline_bytes;
- if(minf.mem_model == VBE_TYPE_DIRECT) {
- vmptr->rbits = minf.rsize;
- vmptr->gbits = minf.gsize;
- vmptr->bbits = minf.bsize;
- vmptr->rshift = minf.rpos;
- vmptr->gshift = minf.gpos;
- vmptr->bshift = minf.bpos;
- vmptr->rmask = calc_mask(minf.rsize, minf.rpos);
- vmptr->gmask = calc_mask(minf.gsize, minf.gpos);
- vmptr->bmask = calc_mask(minf.bsize, minf.bpos);
- /*vmptr->bpp = vmptr->rbits + vmptr->gbits + vmptr->bbits;*/
- }
- if(minf.attr & VBE_ATTR_LFB) {
- vmptr->fb_addr = minf.fb_addr;
- }
- vmptr->max_pages = minf.num_img_pages;
- vmptr->win_gran = minf.win_gran;
-
- infomsg("%04x: ", vbe.modes[i]);
- vbe_print_mode_info(stdout, &minf);
- }
- /*fflush(stdout);*/
-
- vbe_init_ver = VBE_VER_MAJOR(vbe.ver);
- return 0;
-}
-
-void cleanup_video(void)
-{
- free(vmodes);
-}
-
-struct video_mode *video_modes(void)
-{
- return vmodes;
-}
-
-int num_video_modes(void)
-{
- return num_vmodes;
-}
-
-struct video_mode *get_video_mode(int idx)
-{
- if(idx == VMODE_CURRENT) {
- return curmode;
- }
- return vmodes + idx;
-}
-
-int match_video_mode(int xsz, int ysz, int bpp)
-{
- int i, best = -1;
- struct video_mode *vm;
-
- for(i=0; i<num_vmodes; i++) {
- vm = vmodes + i;
- if(vm->xsz != xsz || vm->ysz != ysz) continue;
- if(SAME_BPP(vm->bpp, bpp)) {
- best = i;
- }
- if(vm->bpp == bpp) break;
- }
-
- if(best == -1) {
- errormsg("failed to find video mode %dx%d %d bpp)\n", xsz, ysz, bpp);
- return -1;
- }
- return best;
-}
-
-int find_video_mode(int mode)
-{
- int i;
- struct video_mode *vm;
-
- vm = vmodes;
- for(i=0; i<num_vmodes; i++) {
- if(vm->mode == mode) return i;
- }
- return -1;
-}
-
-void *set_video_mode(int idx, int nbuf)
-{
- unsigned int mode;
- struct video_mode *vm = vmodes + idx;
-
- if(curmode == vm) return vpgaddr[0];
-
- infomsg("setting video mode %x (%dx%d %d bpp)\n", (unsigned int)vm->mode,
- vm->xsz, vm->ysz, vm->bpp);
- /*fflush(stdout);*/
-
- mode = vm->mode | VBE_MODE_LFB;
- if(vbe_setmode(mode) == -1) {
- infomsg("Warning: failed to get a linear framebuffer. falling back to banked mode\n");
- mode = vm->mode;
- if(vbe_setmode(mode) == -1) {
- errormsg("failed to set video mode %x\n", (unsigned int)vm->mode);
- return 0;
- }
- }
-
- /* unmap previous video memory mapping, if there was one (switching modes) */
- if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
- dpmi_munmap(vpgaddr[0]);
- vpgaddr[0] = vpgaddr[1] = 0;
- }
-
- curmode = vm;
- if(nbuf < 1) nbuf = 1;
- if(nbuf > 2) nbuf = 2;
- pgcount = nbuf > vm->max_pages + 1 ? vm->max_pages + 1 : nbuf;
- pgsize = vm->ysz * vm->pitch;
- fbsize = pgcount * pgsize;
-
- if(vm->bpp > 8) {
- infomsg("rgb mask: %x %x %x\n", (unsigned int)vm->rmask,
- (unsigned int)vm->gmask, (unsigned int)vm->bmask);
- infomsg("rgb shift: %d %d %d\n", vm->rshift, vm->gshift, vm->bshift);
- }
- infomsg("pgcount: %d, pgsize: %d, fbsize: %d\n", pgcount, pgsize, fbsize);
- if(vm->fb_addr) {
- infomsg("phys addr: %p\n", (void*)vm->fb_addr);
- }
- /*fflush(stdout);*/
-
- if(vm->fb_addr) {
- vpgaddr[0] = (void*)dpmi_mmap(vm->fb_addr, fbsize);
- if(!vpgaddr[0]) {
- errormsg("failed to map framebuffer (phys: %lx, size: %d)\n",
- (unsigned long)vm->fb_addr, fbsize);
- set_text_mode();
- return 0;
- }
- memset(vpgaddr[0], 0xaa, pgsize);
-
- if(pgcount > 1) {
- vpgaddr[1] = (char*)vpgaddr[0] + pgsize;
- backidx = 1;
- page_flip(FLIP_NOW); /* start with the second page visible */
- } else {
- frontidx = backidx = 0;
- vpgaddr[1] = 0;
- }
-
- blit_frame = blit_frame_lfb;
-
- /* only attempt to set up write combining if the CPU we're running on
- * supports memory type range registers, and we're running on ring 0
- */
- if(CPU_HAVE_MTRR) {
- int cpl = get_cpl();
- if(cpl > 0) {
- errormsg("Can't set framebuffer range to write-combining, running in ring %d\n", cpl);
- } else {
- uint32_t len = (uint32_t)vbe.vmem_blk << 16;
-
- /* if vmem_blk is 0 or if the reported size is absurd (more than
- * 256mb), just use the framebuffer size for this mode to setup the
- * mtrr
- */
- if(!len || len > 0x10000000) {
- infomsg("reported vmem too large or overflowed, using fbsize for wrcomb setup\n");
- len = fbsize;
- }
- print_mtrr();
- enable_wrcomb(vm->fb_addr, len);
- }
- }
-
- } else {
- vpgaddr[0] = VMEM_PTR;
- vpgaddr[1] = 0;
-
- blit_frame = blit_frame_banked;
-
- /* calculate window granularity shift */
- vm->win_gran_shift = 0;
- vm->win_64k_step = 1;
- if(vm->win_gran > 0 && vm->win_gran < 64) {
- int gran = vm->win_gran;
- while(gran < 64) {
- vm->win_gran_shift++;
- gran <<= 1;
- }
- vm->win_64k_step = 1 << vm->win_gran_shift;
- }
-
- infomsg("granularity: %dk (step: %d)\n", vm->win_gran, vm->win_64k_step);
- }
-
- /*fflush(stdout);*/
- return vpgaddr[0];
-}
-
-int set_text_mode(void)
-{
- /* unmap previous video memory mapping, if there was one (switching modes) */
- if(vpgaddr[0] && vpgaddr[0] != VMEM_PTR) {
- dpmi_munmap(vpgaddr[0]);
- vpgaddr[0] = vpgaddr[1] = 0;
- }
-
- vga_setmode(3);
- curmode = 0;
- return 0;
-}
-
-void *page_flip(int vsync)
-{
- if(!vpgaddr[1]) {
- /* page flipping not supported */
- return vpgaddr[0];
- }
-
- vbe_swap(backidx ? pgsize : 0, vsync ? VBE_SWAP_VBLANK : VBE_SWAP_NOW);
- frontidx = backidx;
- backidx = (backidx + 1) & 1;
-
- return vpgaddr[backidx];
-}
-
-
-static void blit_frame_lfb(void *pixels, int vsync)
-{
- if(vsync) wait_vsync();
- memcpy(vpgaddr[frontidx], pixels, pgsize);
-}
-
-static void blit_frame_banked(void *pixels, int vsync)
-{
- int sz, offs, pending;
- unsigned char *pptr = pixels;
-
- if(vsync) wait_vsync();
-
- /* assume initial window offset at 0 */
- offs = 0;
- pending = pgsize;
- while(pending > 0) {
- sz = pending > 65536 ? 65536 : pending;
- memcpy(VMEM_PTR, pptr, sz);
- pptr += sz;
- pending -= sz;
- offs += curmode->win_64k_step;
- vbe_setwin(0, offs);
- }
- vbe_setwin(0, 0);
-}
-
-static uint32_t calc_mask(int sz, int pos)
-{
- uint32_t mask = 0;
- while(sz-- > 0) {
- mask = (mask << 1) | 1;
- }
- return mask << pos;
-}
-
-#define MSR_MTRRCAP 0xfe
-#define MSR_MTRRDEFTYPE 0x2ff
-#define MSR_MTRRBASE(x) (0x200 | ((x) << 1))
-#define MSR_MTRRMASK(x) (0x201 | ((x) << 1))
-#define MTRRDEF_EN 0x800
-#define MTRRCAP_HAVE_WC 0x400
-#define MTRRMASK_VALID 0x800
-
-#define MTRR_WC 1
-
-static int get_page_memtype(uint32_t addr, int num_ranges)
-{
- int i;
- uint32_t rlow, rhigh;
- uint32_t base, mask;
-
- for(i=0; i<num_ranges; i++) {
- get_msr(MSR_MTRRMASK(i), &rlow, &rhigh);
- if(!(rlow & MTRRMASK_VALID)) {
- continue;
- }
- mask = rlow & 0xfffff000;
-
- get_msr(MSR_MTRRBASE(i), &rlow, &rhigh);
- base = rlow & 0xfffff000;
-
- if((addr & mask) == (base & mask)) {
- return rlow & 0xff;
- }
- }
-
- get_msr(MSR_MTRRDEFTYPE, &rlow, &rhigh);
- return rlow & 0xff;
-}
-
-static int check_wrcomb_enabled(uint32_t addr, int len, int num_ranges)
-{
- while(len > 0) {
- if(get_page_memtype(addr, num_ranges) != MTRR_WC) {
- return 0;
- }
- addr += 4096;
- len -= 4096;
- }
- return 1;
-}
-
-static int alloc_mtrr(int num_ranges)
-{
- int i;
- uint32_t rlow, rhigh;
-
- for(i=0; i<num_ranges; i++) {
- get_msr(MSR_MTRRMASK(i), &rlow, &rhigh);
- if(!(rlow & MTRRMASK_VALID)) {
- return i;
- }
- }
- return -1;
-}
-
-static void enable_wrcomb(uint32_t addr, int len)
-{
- int num_ranges, mtrr;
- uint32_t rlow, rhigh;
- uint32_t def, mask;
-
- if(len <= 0 || (addr | (uint32_t)len) & 0xfff) {
- errormsg("failed to enable write combining, unaligned range: %p/%x\n",
- (void*)addr, (unsigned int)len);
- return;
- }
-
- get_msr(MSR_MTRRCAP, &rlow, &rhigh);
- num_ranges = rlow & 0xff;
-
- infomsg("enable_wrcomb: addr=%p len=%x\n", (void*)addr, (unsigned int)len);
-
- if(!(rlow & MTRRCAP_HAVE_WC)) {
- errormsg("failed to enable write combining, processor doesn't support it\n");
- return;
- }
-
- if(check_wrcomb_enabled(addr, len, num_ranges)) {
- return;
- }
-
- if((mtrr = alloc_mtrr(num_ranges)) == -1) {
- errormsg("failed to enable write combining, no free MTRRs\n");
- return;
- }
-
- mask = len - 1;
- mask |= mask >> 1;
- mask |= mask >> 2;
- mask |= mask >> 4;
- mask |= mask >> 8;
- mask |= mask >> 16;
- mask = ~mask & 0xfffff000;
-
- infomsg(" ... mask: %08x\n", (unsigned int)mask);
-
- _disable();
- get_msr(MSR_MTRRDEFTYPE, &def, &rhigh);
- set_msr(MSR_MTRRDEFTYPE, def & ~MTRRDEF_EN, rhigh);
-
- set_msr(MSR_MTRRBASE(mtrr), addr | MTRR_WC, 0);
- set_msr(MSR_MTRRMASK(mtrr), mask | MTRRMASK_VALID, 0);
-
- set_msr(MSR_MTRRDEFTYPE, def | MTRRDEF_EN, 0);
- _enable();
-}
-
-static const char *mtrr_names[] = { "N/A", "W C", "N/A", "N/A", "W T", "W P", "W B" };
-
-static const char *mtrr_type_name(int type)
-{
- if(type < 0 || type >= sizeof mtrr_names / sizeof *mtrr_names) {
- return mtrr_names[0];
- }
- return mtrr_names[type];
-}
-
-static void print_mtrr(void)
-{
- int i, num_ranges;
- uint32_t rlow, rhigh, base, mask;
-
- get_msr(MSR_MTRRCAP, &rlow, &rhigh);
- num_ranges = rlow & 0xff;
-
- for(i=0; i<num_ranges; i++) {
- get_msr(MSR_MTRRBASE(i), &base, &rhigh);
- get_msr(MSR_MTRRMASK(i), &mask, &rhigh);
-
- if(mask & MTRRMASK_VALID) {
- infomsg("mtrr%d: base %p, mask %08x type %s\n", i, (void*)(base & 0xfffff000),
- (unsigned int)(mask & 0xfffff000), mtrr_type_name(base & 0xff));
- } else {
- infomsg("mtrr%d unused (%08x/%08x)\n", i, (unsigned int)base,
- (unsigned int)mask);
- }
- }
- /*fflush(stdout);*/
-}
projects / retroray / blobdiff