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multiboot2: add the framebuffer tag

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Signed-off-by: Andy-Python-Programmer <andypythonappdeveloper@gmail.com>
This commit is contained in:
Andy-Python-Programmer 2021-09-10 18:41:01 +10:00
parent 6d034adc5a
commit 6f15587c85
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1 changed files with 81 additions and 0 deletions
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81
stage23/protos/multiboot2.c
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@ -14,6 +14,7 @@
#include <fs/file.h>
#include <mm/vmm.h>
#include <mm/pmm.h>
#include <drivers/vga_textmode.h>
static uint8_t* multiboot2_info_buffer = NULL;
static uint32_t multiboot2_info_size = 0;
@ -124,12 +125,46 @@ void multiboot2_load(char *config, char* cmdline) {
print("multiboot2: found kernel entry point at: %x\n", entry_point);
struct multiboot_header_tag_framebuffer *fbtag = NULL;
// Iterate through the entries...
for (struct multiboot_header_tag* tag = (struct multiboot_header_tag*)(header + 1);
tag < (struct multiboot_header_tag*)((uintptr_t)header + header->header_length) && tag->type != MULTIBOOT_HEADER_TAG_END;
tag = (struct multiboot_header_tag*)((uintptr_t)tag + ALIGN_UP(tag->size, MULTIBOOT_TAG_ALIGN))) {
switch (tag->type) {
case MULTIBOOT_HEADER_TAG_INFORMATION_REQUEST: {
// Iterate the requests and check if they are supported by or not.
struct multiboot_header_tag_information_request* request = (void*)tag;
uint32_t size = (request->size - sizeof(struct multiboot_header_tag_information_request))
/ sizeof(uint32_t);
for (uint32_t i = 0; i < size; i++) {
uint32_t r = request->requests[i];
switch(r) {
// We already support the following requests:
case MULTIBOOT_TAG_TYPE_CMDLINE:
case MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME:
case MULTIBOOT_TAG_TYPE_MODULE:
case MULTIBOOT_TAG_TYPE_MMAP:
case MULTIBOOT_TAG_TYPE_EFI_MMAP:
case MULTIBOOT_TAG_TYPE_FRAMEBUFFER:
case MULTIBOOT_TAG_TYPE_ELF_SECTIONS:
break;
default: {
if (!(request->flags & MULTIBOOT_HEADER_TAG_OPTIONAL))
panic("multiboot2: requested tag `%d` which is not supported", r);
} break;
}
}
} break;
case MULTIBOOT_HEADER_TAG_FRAMEBUFFER: {
fbtag = (struct multiboot_header_tag_framebuffer*)tag;
} break;
default: panic("multiboot2: unknown tag type");
}
}
@ -168,6 +203,52 @@ void multiboot2_load(char *config, char* cmdline) {
// Create framebuffer tag
//////////////////////////////////////////////
{
if (fbtag) {
size_t req_width = fbtag->width;
size_t req_height = fbtag->height;
size_t req_bpp = 0x00;
char *resolution = config_get_value(config, 0, "RESOLUTION");
if (resolution != NULL)
parse_resolution(&req_width, &req_height, &req_bpp, resolution);
struct fb_info fbinfo;
if (!fb_init(&fbinfo, req_width, req_height, req_bpp))
panic("stivale: Unable to set video mode");
memmap_alloc_range(fbinfo.framebuffer_addr,
(uint64_t)fbinfo.framebuffer_pitch * fbinfo.framebuffer_height,
MEMMAP_FRAMEBUFFER, false, false, false, true);
struct multiboot_tag_framebuffer framebuffer = {
.common = {
.type = MULTIBOOT_TAG_TYPE_FRAMEBUFFER,
.size = sizeof(struct multiboot_tag_framebuffer),
.framebuffer_addr = fbinfo.framebuffer_addr,
.framebuffer_pitch = fbinfo.framebuffer_pitch,
.framebuffer_width = fbinfo.framebuffer_width,
.framebuffer_height = fbinfo.framebuffer_height,
.framebuffer_bpp = fbinfo.framebuffer_bpp,
.framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_RGB // We only support RGB for VBE
},
.framebuffer_red_field_position = fbinfo.red_mask_shift,
.framebuffer_red_mask_size = fbinfo.red_mask_size,
.framebuffer_green_field_position = fbinfo.green_mask_shift,
.framebuffer_green_mask_size = fbinfo.green_mask_size,
.framebuffer_blue_field_position = fbinfo.blue_mask_shift,
.framebuffer_blue_mask_size = fbinfo.blue_mask_size,
};
push_boot_param(&framebuffer, sizeof(struct multiboot_tag_elf_sections));
} else {
#if uefi == 1
panic("multiboot2: Cannot use text mode with UEFI.");
#elif bios == 1
size_t rows, cols;
init_vga_textmode(&rows, &cols, false);
#endif
}
}
//////////////////////////////////////////////