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multiboot: Allow for headless boots

This commit is contained in:
mintsuki 2022-09-27 05:46:39 +02:00
parent 4b4f3c9d68
commit a0810f9e13
3 changed files with 28 additions and 13 deletions
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6
common/protos/multiboot1.c
View File

@ -317,7 +317,7 @@ noreturn void multiboot1_load(char *config, char *cmdline) {
struct fb_info fbinfo;
if (!fb_init(&fbinfo, req_width, req_height, req_bpp)) {
#if defined (UEFI)
panic(true, "multiboot1: Failed to set video mode");
goto skip_modeset;
#elif defined (BIOS)
size_t rows, cols;
init_vga_textmode(&rows, &cols, false);
@ -348,7 +348,7 @@ noreturn void multiboot1_load(char *config, char *cmdline) {
print("multiboot1: Warning: Cannot use text mode with UEFI\n");
struct fb_info fbinfo;
if (!fb_init(&fbinfo, 0, 0, 0)) {
panic(true, "multiboot1: Failed to set video mode");
goto skip_modeset;
}
multiboot1_info->fb_addr = (uint64_t)fbinfo.framebuffer_addr;
multiboot1_info->fb_width = fbinfo.framebuffer_width;
@ -376,6 +376,8 @@ noreturn void multiboot1_load(char *config, char *cmdline) {
}
multiboot1_info->flags |= (1 << 12);
skip_modeset:;
} else {
#if defined (UEFI)
panic(true, "multiboot1: Cannot use text mode with UEFI.");

19
common/protos/multiboot2.c
View File

@ -109,6 +109,8 @@ noreturn void multiboot2_load(char *config, char* cmdline) {
bool is_elf_info_requested = false;
bool is_framebuffer_required = false;
uint64_t entry_point = 0xffffffff;
// Iterate through the entries...
@ -143,7 +145,9 @@ noreturn void multiboot2_load(char *config, char* cmdline) {
case MULTIBOOT_TAG_TYPE_EFI64_IH:
#endif
#endif
break;
case MULTIBOOT_TAG_TYPE_FRAMEBUFFER:
is_framebuffer_required = is_required;
break;
case MULTIBOOT_TAG_TYPE_ACPI_NEW:
is_new_acpi_required = is_required;
@ -521,7 +525,11 @@ noreturn void multiboot2_load(char *config, char* cmdline) {
tag->common.framebuffer_bpp = 16;
tag->common.framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT;
#elif defined (UEFI)
panic(true, "multiboot2: Failed to set video mode");
if (is_framebuffer_required) {
panic(true, "multiboot2: Failed to set video mode");
} else {
goto skip_modeset;
}
#endif
} else {
tag->common.framebuffer_addr = fbinfo.framebuffer_addr;
@ -543,8 +551,13 @@ noreturn void multiboot2_load(char *config, char* cmdline) {
print("multiboot2: Warning: Cannot use text mode with UEFI\n");
struct fb_info fbinfo;
if (!fb_init(&fbinfo, 0, 0, 0)) {
panic(true, "multiboot2: Failed to set video mode");
if (is_framebuffer_required) {
panic(true, "multiboot2: Failed to set video mode");
} else {
goto skip_modeset;
}
}
tag->common.framebuffer_addr = fbinfo.framebuffer_addr;
tag->common.framebuffer_pitch = fbinfo.framebuffer_pitch;
tag->common.framebuffer_width = fbinfo.framebuffer_width;
@ -572,6 +585,8 @@ noreturn void multiboot2_load(char *config, char* cmdline) {
}
append_tag(info_idx, &tag->common);
skip_modeset:;
}
//////////////////////////////////////////////

16
test/multiboot.c
View File

@ -23,7 +23,7 @@ void multiboot_main(uint32_t magic, struct multiboot1_info *info) {
{
struct multiboot1_module *start = (struct multiboot1_module *)info->mods_addr;
struct multiboot1_module *end = (struct multiboot1_module *)(info->mods_addr + info->mods_count);
e9_printf("\t modules:");
for (struct multiboot1_module* entry = start; entry < end; entry++) {
e9_printf("\t\t begin=%x", entry->begin);
@ -32,29 +32,27 @@ void multiboot_main(uint32_t magic, struct multiboot1_info *info) {
}
}
// TODO(Andy-Python-Programmer): ELF sections are unimplemented
{
struct multiboot1_mmap_entry *start = (struct multiboot1_mmap_entry *)info->mmap_addr;
struct multiboot1_mmap_entry *end = (struct multiboot1_mmap_entry *)(info->mmap_addr + info->mmap_length);
e9_printf("\t useable_entries_mmap:");
e9_printf("\t usable_entries_mmap:");
size_t total_mem = 0;
// For now we only print the useable memory map entries since
// For now we only print the usable memory map entries since
// printing the whole memory map blows my terminal up. We also
// iterate through the avaliable memory map entries and add up
// to find the total amount of useable memory.
// to find the total amount of usable memory.
for (struct multiboot1_mmap_entry* entry = start; entry < end; entry++) {
// Check if the memory map entry is marked as useable!
// Check if the memory map entry is marked as usable!
if (entry->type != 1) {
continue;
}
e9_printf("\t\t addr=%x", entry->addr);
e9_printf("\t\t length=%x", entry->len);
e9_printf("\t\t type=Useable");
e9_printf("\t\t type=Usable");
// Now this might be a bit confusing since but `entry->size` represents the
// is the size of the associated structure in bytes and `entry->len` represents the
@ -91,4 +89,4 @@ void multiboot_main(uint32_t magic, struct multiboot1_info *info) {
out:
for (;;);
}
}