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#include <lib.h>
#include <comus/asm.h>
#include <comus/memory.h>
#include <comus/drivers/pci.h>
#include <comus/drivers/gpu.h>
#include <comus/drivers/gpu/bochs.h>
#define INDEX 0x1CE
#define DATA 0x1CF
#define INDEX_ID 0
#define INDEX_XRES 1
#define INDEX_YRES 2
#define INDEX_BPP 3
#define INDEX_ENABLE 4
#define INDEX_BANK 5
#define INDEX_VIRT_WIDTH 6
#define INDEX_VIRT_HEIGHT 7
#define INDEX_X_OFFSET 8
#define INDEX_Y_OFFSET 9
#define DATA_DISP_DISABLE 0x00
#define DATA_DISP_ENABLE 0x01
#define DATA_LFB_ENABLE 0x40
#define DATA_NO_CLEAR_MEM 0x80
#define BOCHS_PCI_VENDOR 0x1234
#define BOCHS_PCI_DEVICE 0x1111
#define BOCHS_WIDTH 1024
#define BOCHS_HEIGHT 768
#define BOCHS_BIT_DEPTH 32
struct gpu bochs_dev = { 0 };
static void write(uint16_t index, uint16_t data)
{
outw(INDEX, index);
outw(DATA, data);
}
static uint16_t read(uint16_t value)
{
outw(INDEX, value);
return inw(DATA);
}
int bochs_init(struct gpu **gpu_dev)
{
struct pci_device bochs = { 0 };
bool found =
pci_findby_id(&bochs, BOCHS_PCI_DEVICE, BOCHS_PCI_VENDOR, NULL);
if (!found)
return 1;
write(INDEX_ENABLE, DATA_DISP_DISABLE);
write(INDEX_XRES, BOCHS_WIDTH);
write(INDEX_YRES, BOCHS_HEIGHT);
write(INDEX_BPP, BOCHS_BIT_DEPTH);
write(INDEX_ENABLE, DATA_DISP_ENABLE | DATA_LFB_ENABLE);
if (read(INDEX_ID) != 0xB0C5)
return 1;
uint32_t bar0 = pci_rcfg_d(bochs, PCI_BAR0_D);
uint32_t *addr = (uint32_t *)(uintptr_t)bar0;
bochs_dev.name = "Bochs";
bochs_dev.width = BOCHS_WIDTH;
bochs_dev.height = BOCHS_HEIGHT;
bochs_dev.bit_depth = BOCHS_BIT_DEPTH;
bochs_dev.framebuffer =
kmapaddr(addr, NULL, BOCHS_WIDTH * BOCHS_HEIGHT * (BOCHS_BIT_DEPTH / 8),
F_WRITEABLE);
*gpu_dev = &bochs_dev;
return 0;
}
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