66 lines
1.4 KiB
C
66 lines
1.4 KiB
C
/*
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* vim:tabstop=4
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* vim:noexpandtab
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*
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* Bochs VBE / QEMU vga=std Graphics Driver
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*/
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#include <system.h>
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uint16_t bochs_resolution_x = 1024;
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uint16_t bochs_resolution_y = 768;
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uint16_t bochs_resolution_b = 32;
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uint16_t bochs_current_bank = 0;
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#define BOCHS_BANK_SIZE 16384
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#define BOCHS_VID_MEMORY ((uint32_t *)0xA0000)
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void
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graphics_install_bochs() {
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outports(0x1CE, 0x00);
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outports(0x1CF, 0xB0C4);
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short i = inports(0x1CF);
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kprintf("[bochs] Graphics ID is %x\n", (unsigned int)i);
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kprintf("[bochs] Enabling 1024x768x32 graphics mode!\n");
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/* Disable VBE */
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outports(0x1CE, 0x04);
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outports(0x1CF, 0x00);
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/* Set X resolution to 1024 */
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outports(0x1CE, 0x01);
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outports(0x1CF, 1024);
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/* Set Y resolution to 768 */
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outports(0x1CE, 0x02);
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outports(0x1CF, 768);
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/* Set bpp to 8 */
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outports(0x1CE, 0x03);
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outports(0x1CF, 0x20);
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/* Re-enable VBE */
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outports(0x1CE, 0x04);
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outports(0x1CF, 0x01);
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}
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void
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bochs_set_bank(
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uint16_t bank
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) {
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if (bank == bochs_current_bank) {
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/* We are already in this bank, stop wasting cycles */
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return;
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}
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outports(0x1CE, 0x05); /* Bank */
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outports(0x1CF, bank);
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bochs_current_bank = bank;
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}
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void
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bochs_set_coord(
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uint16_t x,
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uint16_t y,
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uint32_t color
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) {
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uint32_t location = y * bochs_resolution_x + x;
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bochs_set_bank(location / BOCHS_BANK_SIZE);
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uint32_t offset = location % BOCHS_BANK_SIZE;
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BOCHS_VID_MEMORY[offset] = color;
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}
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