mirror of
https://github.com/limine-bootloader/limine
synced 2024-12-03 21:52:39 +03:00
101 lines
3.0 KiB
C
101 lines
3.0 KiB
C
#include <stdint.h>
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#include <lib/libc.h>
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#include <lib/print.h>
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#include <mm/pmm.h>
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#include <lib/blib.h>
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#include <sys/cpu.h>
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struct dma_descr {
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uint32_t control;
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uint32_t length;
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uint64_t address;
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};
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struct fw_cfg_file {
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uint32_t size;
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uint16_t select;
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uint16_t reserved;
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char name[56];
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};
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struct fw_cfg_files {
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uint32_t count;
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struct fw_cfg_file f[];
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};
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static uint16_t bswap16(uint16_t value) {
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uint8_t* value_ptr = (uint8_t*)&value;
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return value_ptr[0]<<8|value_ptr[1];
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}
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static uint32_t bswap32(uint32_t value) {
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uint8_t* value_ptr = (uint8_t*)&value;
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return value_ptr[0]<<24|value_ptr[1]<<16|value_ptr[2]<<8|value_ptr[3];
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}
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static void fwcfg_disp_read(uint16_t sel, uint32_t outsz, uint8_t* outbuf) {
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outw(0x510, sel);
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for (uint32_t i = 0;i < outsz;i++) outbuf[i] = inb(0x511);
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}
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static struct fw_cfg_files* filebuf = NULL;
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static const char* simple_mode_config =
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"TIMEOUT=0\n"
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":simple mode config\n"
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"KERNEL_PATH=fwcfg:///opt/org.limine-bootloader.kernel";
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static const char* simple_mode_bg_config =
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"TIMEOUT=0\n"
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"GRAPHICS=yes\n"
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"THEME_BACKGROUND=50000000\n"
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"BACKGROUND_PATH=fwcfg:///opt/org.limine-bootloader.background\n"
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"BACKGROUND_STYLE=stretched\n"
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":simple mode config\n"
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"KERNEL_PATH=fwcfg:///opt/org.limine-bootloader.kernel";
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static bool simple_mode = false;
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bool fwcfg_open(struct file_handle *handle, const char *name) {
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char sig[5] = { 0 };
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fwcfg_disp_read(/* signature */ 0x0000, 4, (uint8_t*)sig);
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if (strcmp(sig, "QEMU")) return false;
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uint32_t count;
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fwcfg_disp_read(0x0019, 4, (uint8_t*)&count);
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count = bswap32(count);
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if (!filebuf) {
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filebuf = (struct fw_cfg_files*)ext_mem_alloc(count * 64 + 4);
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fwcfg_disp_read(0x0019, count * 64 + 4, (uint8_t*)filebuf);
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}
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bool has_kernel = false, has_background = false;
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for (uint32_t i = 0;i < count;i++) {
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if (!strncmp(filebuf->f[i].name, name, 56)) {
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uint16_t sel = bswap16(filebuf->f[i].select);
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handle->size = bswap32(filebuf->f[i].size);
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handle->is_memfile = true;
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uint8_t* buf = (uint8_t*)(handle->fd = ext_mem_alloc(handle->size));
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fwcfg_disp_read(sel, handle->size, buf);
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return true;
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}
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if (!strncmp(filebuf->f[i].name, "opt/org.limine-bootloader.background", 56)) {
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has_background = true;
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}
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if (!strncmp(filebuf->f[i].name, "opt/org.limine-bootloader.kernel", 56)) {
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has_kernel = true;
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}
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}
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if (has_kernel && !strcmp(name, "opt/org.limine-bootloader.config")) {
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const char* conf = has_background ? simple_mode_bg_config : simple_mode_config;
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handle->size = strlen(conf);
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handle->is_memfile = true;
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char* buf = (char*)(handle->fd = ext_mem_alloc(handle->size + 1));
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strcpy(buf, conf);
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simple_mode = true;
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return true;
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}
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return false;
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}
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