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https://github.com/kanjitalk755/macemu.git
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- video on SEGV signals
This commit is contained in:
gbeauche
parent
13bd5c97b9
commit
fbabba29ee
416
BasiliskII/src/Unix/video_vosf.h
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416
BasiliskII/src/Unix/video_vosf.h
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@ -0,0 +1,416 @@
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/*
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* video_vosf.h - Video/graphics emulation, video on SEGV signals support
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*
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* Basilisk II (C) 1997-2000 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef VIDEO_VOSF_H
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#define VIDEO_VOSF_H
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// Note: this file is #include'd in video_x.cpp
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#ifdef ENABLE_VOSF
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/*
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* Page-aligned memory allocation
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*/
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// Align on page boundaries
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static uint32 align_on_page_boundary(uint32 size)
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{
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const uint32 page_size = getpagesize();
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const uint32 page_mask = page_size - 1;
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return (size + page_mask) & ~page_mask;
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}
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// Allocate memory on page boundary
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static void * allocate_framebuffer(uint32 size, uint8 * hint = 0)
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{
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// Remind that the system can allocate at 0x00000000...
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return mmap((caddr_t)hint, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, zero_fd, 0);
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}
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/*
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* Screen depth identification
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*/
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enum {
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ID_DEPTH_UNKNOWN = -1,
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ID_DEPTH_1,
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ID_DEPTH_8,
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ID_DEPTH_15,
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ID_DEPTH_16,
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ID_DEPTH_24,
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ID_DEPTH_32 = ID_DEPTH_24,
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ID_DEPTH_COUNT
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};
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static int depth_id(int depth)
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{
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int id;
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switch (depth) {
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case 1 : id = ID_DEPTH_1; break;
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case 8 : id = ID_DEPTH_8; break;
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case 15 : id = ID_DEPTH_15; break;
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case 16 : id = ID_DEPTH_16; break;
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case 24 : id = ID_DEPTH_24; break;
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case 32 : id = ID_DEPTH_32; break;
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default : id = ID_DEPTH_UNKNOWN;
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}
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return id;
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}
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/*
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* Frame buffer copy function templates
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*/
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// No conversion required
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#define MEMCPY_PROFITABLE
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#ifdef MEMCPY_PROFITABLE
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static void do_fbcopy_raw(uint8 * dest, const uint8 * source, uint32 length)
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{
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memcpy(dest, source, length);
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}
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#else
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#error "incomplete"
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#define FB_BLIT_1(dst, src) (dst = (src))
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#define FB_BLIT_2(dst, src) (dst = (src))
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#define FB_DEPTH 8
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#define FB_FUNC_NAME do_fbcopy_raw
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#include "video_blit.h"
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#endif
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// RGB 555
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#define FB_BLIT_1(dst, src) \
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(dst = (((src) >> 8) & 0xff) | (((src) & 0xff) << 8))
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#define FB_BLIT_2(dst, src) \
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(dst = (((src) >> 8) & 0x00ff00ff) | (((src) & 0x00ff00ff) << 8))
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#define FB_DEPTH 15
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#define FB_FUNC_NAME do_fbcopy_15
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#include "video_blit.h"
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// RGB 565
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#define FB_BLIT_1(dst, src) \
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(dst = (((src) >> 8) & 0x001f) | (((src) << 9) & 0xfe00) | (((src) >> 7) & 0x01c0))
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#define FB_BLIT_2(dst, src) \
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(dst = (((src) >> 8) & 0x001f001f) | (((src) << 9) & 0xfe00fe00) | (((src) >> 7) & 0x01c001c0))
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#define FB_DEPTH 16
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#define FB_FUNC_NAME do_fbcopy_16
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#include "video_blit.h"
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// RGB 888
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#define FB_BLIT_1(dst, src) \
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(dst = (src))
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#define FB_BLIT_2(dst, src) \
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(dst = (((src) >> 24) & 0xff) | (((src) >> 16) & 0xff00) | (((src) & 0xff00) << 16) | (((src) & 0xff) << 24))
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#define FB_DEPTH 24
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#define FB_FUNC_NAME do_fbcopy_24
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#include "video_blit.h"
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/*
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* Frame buffer copy functions map table
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*/
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typedef void (*fbcopy_func)(uint8 *, const uint8 *, uint32);
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static fbcopy_func do_update_framebuffer;
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#define FBCOPY_FUNC(aHandler) do_ ## aHandler
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#if REAL_ADDRESSING || DIRECT_ADDRESSING
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#define WD(X) { FBCOPY_FUNC(X), FBCOPY_FUNC(X) }
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#else
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#define WD(X) { FBCOPY_FUNC(fbcopy_raw), FBCOPY_FUNC(fbcopy_raw) }
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#endif
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// fb_copy_funcs[depth_id][native_byte_order][dga_mode]
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// NT : not tested
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// OK : has been successfully tested
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// NBO : native byte order
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static fbcopy_func fbcopy_funcs[ID_DEPTH_COUNT][2][2] = {
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#ifdef WORDS_BIGENDIAN
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/* alt byte order native byte order */
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/* 1 bpp */ { WD(fbcopy_raw) , WD(fbcopy_raw) }, // NT
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/* 8 bpp */ { WD(fbcopy_raw) , WD(fbcopy_raw) }, // OK (NBO)
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/* 15 bpp */ { WD(fbcopy_15) , WD(fbcopy_raw) }, // NT
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/* 16 bpp */ { WD(fbcopy_16) , WD(fbcopy_raw) }, // NT
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/* 24 bpp */ { WD(fbcopy_24) , WD(fbcopy_raw) } // NT
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#else
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/* 1 bpp */ { WD(fbcopy_raw) , WD(fbcopy_raw) }, // NT
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/* 8 bpp */ { WD(fbcopy_raw) , WD(fbcopy_raw) }, // OK (NBO)
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/* 15 bpp */ { WD(fbcopy_15) , WD(fbcopy_15) }, // OK (NBO)
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/* 16 bpp */ { WD(fbcopy_16) , WD(fbcopy_16) }, // OK (NBO)
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/* 24 bpp */ { WD(fbcopy_24) , WD(fbcopy_24) } // NT
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#endif
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};
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#undef WD
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#define FBCOPY_FUNC_ERROR \
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ErrorAlert("Invalid screen depth")
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#define GET_FBCOPY_FUNC(aDepth, aNativeByteOrder, aDisplay) \
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((depth_id(aDepth) == ID_DEPTH_UNKNOWN) ? ( FBCOPY_FUNC_ERROR, (fbcopy_func)0 ) : \
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fbcopy_funcs[depth_id(aDepth)][(aNativeByteOrder)][(aDisplay) == DISPLAY_DGA ? 1 : 0])
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/*
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* Screen fault handler
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*/
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static inline void do_handle_screen_fault(unsigned long addr)
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{
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if ((addr < mainBuffer.memStart) || (addr >= mainBuffer.memEnd)) {
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fprintf(stderr, "Segmentation fault at 0x%08X\n", addr);
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abort();
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}
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const int page = (addr - mainBuffer.memStart) >> mainBuffer.pageBits;
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caddr_t page_ad = (caddr_t)(addr & ~(mainBuffer.pageSize - 1));
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#ifdef HAVE_PTHREADS
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pthread_mutex_lock(&Screen_draw_lock);
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#endif
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PFLAG_SET(page);
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mprotect(page_ad, mainBuffer.pageSize, PROT_READ | PROT_WRITE);
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#ifdef HAVE_PTHREADS
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pthread_mutex_unlock(&Screen_draw_lock);
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#endif
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}
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#if defined(HAVE_SIGINFO_T)
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static void Screen_fault_handler(int, siginfo_t * sip, void *)
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{
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D(bug("Screen_fault_handler: ADDR=0x%08X\n", sip->si_addr));
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do_handle_screen_fault((unsigned long)sip->si_addr);
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}
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#elif defined(HAVE_SIGCONTEXT_SUBTERFUGE)
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# if defined(__i386__) && defined(__linux__)
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static void Screen_fault_handler(int, struct sigcontext scs)
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{
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D(bug("Screen_fault_handler: ADDR=0x%08X from IP=0x%08X\n", scs.cr2, scs.eip));
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do_handle_screen_fault((unsigned long)scs.cr2);
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}
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# else
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# error "No suitable subterfuge for Video on SEGV signals"
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# endif
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#else
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# error "Can't do Video on SEGV signals"
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#endif
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/*
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* Screen fault handler initialization
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*/
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#if defined(HAVE_SIGINFO_T)
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static bool Screen_fault_handler_init()
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{
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// Setup SIGSEGV handler to process writes to frame buffer
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sigemptyset(&vosf_sa.sa_mask);
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vosf_sa.sa_sigaction = Screen_fault_handler;
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vosf_sa.sa_flags = 0;
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return (sigaction(SIGSEGV, &vosf_sa, NULL) == 0);
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}
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#elif defined(HAVE_SIGCONTEXT_SUBTERFUGE)
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static bool Screen_fault_handler_init()
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{
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// Setup SIGSEGV handler to process writes to frame buffer
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sigemptyset(&vosf_sa.sa_mask);
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vosf_sa.sa_handler = (void (*)(int)) Screen_fault_handler;
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vosf_sa.sa_flags = 0;
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return (sigaction(SIGSEGV, &vosf_sa, NULL) == 0);
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}
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#endif
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/*
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* Update display for Windowed mode and VOSF
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*/
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static inline void update_display_window_vosf(void)
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{
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int page = 0;
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for (;;) {
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while (PFLAG_ISCLEAR_4(page))
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page += 4;
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while (PFLAG_ISCLEAR(page))
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page++;
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if (page >= mainBuffer.pageCount)
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break;
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const int first_page = page;
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PFLAG_CLEAR(first_page);
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while ((++page < mainBuffer.pageCount) && PFLAG_ISSET(page))
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PFLAG_CLEAR(page);
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// Make the dirty pages read-only again
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const int32 offset = first_page << mainBuffer.pageBits;
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const uint32 length = (page - first_page) << mainBuffer.pageBits;
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mprotect((caddr_t)(mainBuffer.memStart + offset), length, PROT_READ);
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// There is at least one line to update
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const int y1 = mainBuffer.pageInfo[first_page].top;
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const int y2 = mainBuffer.pageInfo[page - 1].bottom;
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const int height = y2 - y1 + 1;
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const int bytes_per_row = VideoMonitor.bytes_per_row;
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const int bytes_per_pixel = VideoMonitor.bytes_per_row / VideoMonitor.x;
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int i, j;
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// Check for first column from left and first column
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// from right that have changed
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int x1 = VideoMonitor.x * bytes_per_pixel - 1;
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for (j = y1; j <= y2; j++) {
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uint8 * const p1 = &the_buffer[j * bytes_per_row];
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uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
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for (i = 0; i < x1; i++) {
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if (p1[i] != p2[i]) {
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x1 = i;
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break;
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}
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}
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}
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x1 /= bytes_per_pixel;
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int x2 = x1 * bytes_per_pixel;
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for (j = y2; j >= y1; j--) {
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uint8 * const p1 = &the_buffer[j * bytes_per_row];
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uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
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for (i = VideoMonitor.x * bytes_per_pixel - 1; i > x2; i--) {
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if (p1[i] != p2[i]) {
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x2 = i;
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break;
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}
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}
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}
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x2 /= bytes_per_pixel;
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// Update the_host_buffer and copy of the_buffer
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// There is at least one pixel to copy
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const int width = x2 - x1 + 1;
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i = y1 * bytes_per_row + x1 * bytes_per_pixel;
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for (j = y1; j <= y2; j++) {
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do_update_framebuffer(the_host_buffer + i, the_buffer + i, bytes_per_pixel * width);
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memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * width);
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i += bytes_per_row;
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}
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if (have_shm)
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XShmPutImage(x_display, the_win, the_gc, img, x1, y1, x1, y1, width, height, 0);
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else
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XPutImage(x_display, the_win, the_gc, img, x1, y1, x1, y1, width, height);
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}
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}
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/*
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* Update display for DGA mode and VOSF
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* (only in Direct Addressing mode)
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*/
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#if REAL_ADDRESSING || DIRECT_ADDRESSING
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static inline void update_display_dga_vosf(void)
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{
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int page = 0;
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for (;;) {
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while (PFLAG_ISCLEAR_4(page))
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page += 4;
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while (PFLAG_ISCLEAR(page))
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page++;
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if (page >= mainBuffer.pageCount)
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break;
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const int first_page = page;
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PFLAG_CLEAR(first_page);
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while ((++page < mainBuffer.pageCount) && PFLAG_ISSET(page))
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PFLAG_CLEAR(page);
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// Make the dirty pages read-only again
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const int32 offset = first_page << mainBuffer.pageBits;
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const uint32 length = (page - first_page) << mainBuffer.pageBits;
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mprotect((caddr_t)(mainBuffer.memStart + offset), length, PROT_READ);
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// I am sure that y2 >= y1 and depth != 1
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const int y1 = mainBuffer.pageInfo[first_page].top;
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const int y2 = mainBuffer.pageInfo[page - 1].bottom;
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const int bytes_per_row = VideoMonitor.bytes_per_row;
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const int bytes_per_pixel = VideoMonitor.bytes_per_row / VideoMonitor.x;
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int i, j;
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// Check for first column from left and first column
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// from right that have changed
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int x1 = VideoMonitor.x * bytes_per_pixel - 1;
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for (j = y1; j <= y2; j++) {
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uint8 * const p1 = &the_buffer[j * bytes_per_row];
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uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
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for (i = 0; i < x1; i++) {
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if (p1[i] != p2[i]) {
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x1 = i;
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break;
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}
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}
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}
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x1 /= bytes_per_pixel;
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int x2 = x1 * bytes_per_pixel;
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for (j = y2; j >= y1; j--) {
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uint8 * const p1 = &the_buffer[j * bytes_per_row];
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uint8 * const p2 = &the_buffer_copy[j * bytes_per_row];
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for (i = VideoMonitor.x * bytes_per_pixel - 1; i > x2; i--) {
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if (p1[i] != p2[i]) {
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x2 = i;
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break;
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}
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}
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}
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x2 /= bytes_per_pixel;
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// Update the_host_buffer and copy of the_buffer
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// There should be at least one pixel to copy
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const int width = x2 - x1 + 1;
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i = y1 * bytes_per_row + x1 * bytes_per_pixel;
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for (j = y1; j <= y2; j++) {
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do_update_framebuffer(the_host_buffer + i, the_buffer + i, bytes_per_pixel * width);
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memcpy(the_buffer_copy + i, the_buffer + i, bytes_per_pixel * width);
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i += bytes_per_row;
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}
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}
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}
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#endif
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#endif /* ENABLE_VOSF */
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#endif /* VIDEO_VOSF_H */
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