X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fdevices%2Fcga.c;fp=palacios%2Fsrc%2Fdevices%2Fcga.c;h=aabe81072351e785a9829fec4bdbe90751ccfd25;hb=b54cbe1dbbe15ed228de7472ea284df96ecce909;hp=0000000000000000000000000000000000000000;hpb=1786dcbd1b5a05d2591556db17bff62465713ee1;p=palacios.git diff --git a/palacios/src/devices/cga.c b/palacios/src/devices/cga.c new file mode 100644 index 0000000..aabe810 --- /dev/null +++ b/palacios/src/devices/cga.c @@ -0,0 +1,410 @@ +/* + * This file is part of the Palacios Virtual Machine Monitor developed + * by the V3VEE Project with funding from the United States National + * Science Foundation and the Department of Energy. + * + * The V3VEE Project is a joint project between Northwestern University + * and the University of New Mexico. You can find out more at + * http://www.v3vee.org + * + * Copyright (c) 2009, Robert Deloatch + * Copyright (c) 2009, Steven Jaconette + * Copyright (c) 2009, The V3VEE Project + * All rights reserved. + * + * Author: Robdert Deloatch + * Steven Jaconette + * + * This is free software. You are permitted to use, + * redistribute, and modify it as specified in the file "V3VEE_LICENSE". + */ + +#include +#include +#include +#include + +#include + + + +/* +#ifndef DEBUG_CGA +#undef PrintDebug +#define PrintDebug(fmt, args...) +#endif +*/ + +#define START_ADDR 0xB8000 +#define END_ADDR 0xC0000 + +#define FRAMEBUF_SIZE (END_ADDR - START_ADDR) +#define SCREEN_SIZE 4000 + +#define BASE_CGA_PORT 0x3B0 + +#define NUM_COLS 80 +#define NUM_ROWS 25 +#define BYTES_PER_ROW (NUM_COLS * 2) +#define BYTES_PER_COL 2 + + +struct video_internal { + uint8_t * framebuf; + + // These store the values for unhandled ports, in case of a read op + uint8_t port_store[44]; + + + uint8_t crtc_index_reg; // io port 3D4 + uint8_t crtc_data_regs[25]; // io port 3D5 + + uint16_t screen_offset; // relative to the framebuffer + uint16_t cursor_offset; // relative to the framebuffer + + // updating the screen offset is not atomic, + // so we need a temp variable to hold the partial update + uint16_t tmp_screen_offset; + + + uint8_t passthrough; + + + struct v3_console_ops * ops; + void * private_data; + + + +}; + + + + +static void passthrough_in(uint16_t port, void * src, uint_t length) { + switch (length) { + case 1: + *(uint8_t *)src = v3_inb(port); + break; + case 2: + *(uint16_t *)src = v3_inw(port); + break; + case 4: + *(uint32_t *)src = v3_indw(port); + break; + default: + break; + } +} + + +static void passthrough_out(uint16_t port, void * src, uint_t length) { + switch (length) { + case 1: + v3_outb(port, *(uint8_t *)src); + break; + case 2: + v3_outw(port, *(uint16_t *)src); + break; + case 4: + v3_outdw(port, *(uint32_t *)src); + break; + default: + break; + } +} + +static int video_write_mem(addr_t guest_addr, void * dest, uint_t length, void * priv_data) { + struct vm_device * dev = (struct vm_device *)priv_data; + struct video_internal * state = (struct video_internal *)dev->private_data; + uint_t fb_offset = guest_addr - START_ADDR; + uint_t screen_byte_offset = state->screen_offset * BYTES_PER_COL; + + PrintDebug("Guest address: %p length = %d, fb_offset=%d, screen_offset=%d\n", + (void *)guest_addr, length, fb_offset, screen_byte_offset); + + if (state->passthrough) { + memcpy(state->framebuf + fb_offset, V3_VAddr((void *)guest_addr), length); + } + + if ((fb_offset >= screen_byte_offset) && (fb_offset < (screen_byte_offset + SCREEN_SIZE))) { + uint_t screen_pos = fb_offset - screen_byte_offset; + uint_t x = (screen_pos % BYTES_PER_ROW) / BYTES_PER_COL; + uint_t y = screen_pos / BYTES_PER_ROW; + PrintDebug("Sending Screen update\n"); + + if (state->ops) { + PrintDebug("\tcalling update_screen()\n"); + state->ops->update_screen(x, y, length, state->private_data); + } + } + + return length; +} + +static int video_read_port(uint16_t port, void * dest, uint_t length, struct vm_device * dev) { + struct video_internal * video_state = (struct video_internal *)dev->private_data; + + + PrintDebug("Video: Read port 0x%x\n", port); + + if (video_state->passthrough) { + passthrough_in(port, dest, length); + } + + return length; +} + + + +static int video_write_port(uint16_t port, void * src, uint_t length, struct vm_device * dev) { + struct video_internal * video_state = (struct video_internal *)dev->private_data; + + + PrintDebug("Video: write port 0x%x...\n", port); + + if (video_state->passthrough) { + passthrough_out(port, src, length); + } + + return length; +} + + + +static int crtc_data_write(uint16_t port, void * src, uint_t length, struct vm_device * dev) { + struct video_internal * video_state = (struct video_internal *)dev->private_data; + uint8_t val = *(uint8_t *)src; + uint_t index = video_state->crtc_index_reg; + + if (length != 1) { + PrintError("Invalid write length for port 0x%x\n", port); + return -1; + } + + PrintDebug("Video: write on port 0x%x... (val=0x%x)\n", port, val); + + video_state->crtc_data_regs[index] = val; + + switch (index) { + case 0x0c: { // scroll high byte + uint16_t tmp_val = val; + video_state->tmp_screen_offset = ((tmp_val << 8) & 0xff00); + break; + } + case 0x0d: { // Scroll low byte + int diff = 0; + + video_state->tmp_screen_offset += val; + diff = (video_state->tmp_screen_offset - video_state->screen_offset) / NUM_COLS; + + // Update the true offset value + video_state->screen_offset = video_state->tmp_screen_offset; + video_state->tmp_screen_offset = 0; + + PrintDebug("Scroll lines = %d, new screen offset=%d\n", + diff, video_state->screen_offset * BYTES_PER_COL); + + if (video_state->ops) { + if (video_state->ops->scroll(diff, video_state->private_data) == -1) { + PrintError("Error sending scroll event\n"); + return -1; + } + } + break; + } + case 0x0E: { // Cursor adjustment High byte + uint16_t tmp_val = val; + video_state->cursor_offset = ((tmp_val << 8) & 0xff00); + + break; + } + case 0x0F: { // cursor adjustment low byte + uint_t x = 0; + uint_t y = 0; + + video_state->cursor_offset += val; + + x = video_state->cursor_offset % NUM_COLS; + y = (video_state->cursor_offset - video_state->screen_offset) / NUM_COLS; + + PrintDebug("New Cursor Location; X=%d Y=%d\n", x, y); + + if (video_state->ops) { + if (video_state->ops->update_cursor(x, y, video_state->private_data) == -1) { + PrintError("Error updating cursor\n"); + return -1; + } + } + + break; + } + default: + break; + } + + if (video_state->passthrough) { + passthrough_out(port, src, length); + } + + return length; +} + + +static int crtc_index_write(uint16_t port, void * src, uint_t length, struct vm_device * dev) { + struct video_internal * video_state = (struct video_internal *)dev->private_data; + + if (length > 2) { + PrintError("Invalid write length for crtc index register port: %d (0x%x)\n", + port, port); + return -1; + } + + + video_state->crtc_index_reg = *(uint8_t *)src; + + // Only do the passthrough IO for the first byte + // the second byte will be done in the data register handler + if (video_state->passthrough) { + passthrough_out(port, src, 1); + } + + if (length == 2) { + if (crtc_data_write(port + 1, src + 1, length - 1, dev) != (length - 1)) { + PrintError("could not handle implicit crtc data write\n"); + return -1; + } + } + + return length; +} + + + +int v3_cons_get_fb(struct vm_device * frontend_dev, uint8_t * dst, uint_t offset, uint_t length) { + struct video_internal * state = (struct video_internal *)frontend_dev->private_data; + uint_t screen_byte_offset = state->screen_offset * BYTES_PER_COL; + + PrintDebug("Getting framebuffer for screen; framebuf=%p, screen_offset=%d, offset=%d, length=%d\n", + state->framebuf, screen_byte_offset, offset, length); + + memcpy(dst, state->framebuf + screen_byte_offset + offset, length); + + return 0; +} + + + +static int free_device(struct vm_device * dev) { + v3_unhook_mem(dev->vm, START_ADDR); + return 0; +} + + + +static struct v3_device_ops dev_ops = { + .free = free_device, + .reset = NULL, + .start = NULL, + .stop = NULL, +}; + +static int cga_init(struct guest_info * vm, void * cfg_data) { + struct video_internal * video_state = (struct video_internal *)V3_Malloc(sizeof(struct video_internal)); + addr_t frame_buf_pa = 0; + uint32_t enable_passthrough = (uint32_t)(addr_t)cfg_data; + + + PrintDebug("video: init_device\n"); + + struct vm_device * dev = v3_allocate_device("CGA_VIDEO", &dev_ops, video_state); + + if (v3_attach_device(vm, dev) == -1) { + PrintError("Could not attach device %s\n", "CGA_VIDEO"); + return -1; + } + + frame_buf_pa = (addr_t)V3_AllocPages(FRAMEBUF_SIZE / 4096); + + video_state->framebuf = V3_VAddr((void *)frame_buf_pa); + memset(video_state->framebuf, 0, FRAMEBUF_SIZE); + + PrintDebug("PA of array: %p\n", (void *)frame_buf_pa); + + video_state->passthrough = enable_passthrough; + + video_state->ops = NULL; + video_state->private_data = NULL; + + if (enable_passthrough) { + PrintDebug("Enabling CGA Passthrough\n"); + + if (v3_hook_write_mem(vm, START_ADDR, END_ADDR, START_ADDR, &video_write_mem, dev) == -1) { + PrintDebug("\n\nVideo Hook failed.\n\n"); + } + } else { + if (v3_hook_write_mem(vm, START_ADDR, END_ADDR, frame_buf_pa, &video_write_mem, dev) == -1) { + PrintDebug("\n\nVideo Hook failed.\n\n"); + } + } + + + v3_dev_hook_io(dev, 0x3b0, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3b1, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3b2, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3b3, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3b4, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3b5, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3b6, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3b7, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3b8, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3b9, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3ba, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3bb, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c0, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c1, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c2, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c3, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c4, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c5, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c6, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c7, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c8, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3c9, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3ca, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3cb, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3cc, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3cd, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3ce, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3cf, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3d0, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3d1, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3d2, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3d3, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3d4, &video_read_port, &crtc_index_write); + v3_dev_hook_io(dev, 0x3d5, &video_read_port, &crtc_data_write); + v3_dev_hook_io(dev, 0x3d6, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3d7, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3d8, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3d9, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3da, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3db, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3dc, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3dd, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3de, &video_read_port, &video_write_port); + v3_dev_hook_io(dev, 0x3df, &video_read_port, &video_write_port); + + + return 0; +} + +device_register("CGA_VIDEO", cga_init); + + +int v3_console_register_cga(struct vm_device * cga_dev, struct v3_console_ops * ops, void * private_data) { + struct video_internal * video_state = (struct video_internal *)cga_dev->private_data; + + video_state->ops = ops; + video_state->private_data = private_data; + + return 0; +}