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multiboot1 and 2: General fixes and cleanup

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This commit is contained in:
mintsuki 2021-09-14 07:43:17 +02:00
parent fa5fa057bd
commit fe882a8b2e
2 changed files with 89 additions and 79 deletions
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14
stage23/protos/multiboot1.c
View File

@ -34,7 +34,7 @@ void multiboot1_load(char *config, char *cmdline) {
if (!uri_open(kernel_file, kernel_path))
panic("multiboot1: Failed to open kernel with path `%s`. Is the path correct?", kernel_path);
uint8_t *kernel = freadall(kernel_file, MEMMAP_USABLE);
uint8_t *kernel = freadall(kernel_file, MEMMAP_KERNEL_AND_MODULES);
struct multiboot1_header header = {0};
size_t header_offset = 0;
@ -55,8 +55,8 @@ void multiboot1_load(char *config, char *cmdline) {
if (header.magic + header.flags + header.checksum)
panic("multiboot1: Header checksum is invalid");
uint32_t entry_point = 0;
uint32_t kernel_top = 0;
uint32_t entry_point;
uint32_t kernel_top;
if (header.flags & (1 << 16)) {
if (header.load_addr > header.header_addr)
@ -190,8 +190,9 @@ void multiboot1_load(char *config, char *cmdline) {
parse_resolution(&req_width, &req_height, &req_bpp, resolution);
struct fb_info fbinfo;
if (!fb_init(&fbinfo, req_width, req_height, req_bpp))
panic("multiboot1: Unable to set video mode");
if (!fb_init(&fbinfo, req_width, req_height, req_bpp)) {
goto nofb;
}
multiboot1_info.fb_addr = (uint64_t)fbinfo.framebuffer_addr;
multiboot1_info.fb_width = fbinfo.framebuffer_width;
@ -206,13 +207,14 @@ void multiboot1_load(char *config, char *cmdline) {
multiboot1_info.fb_blue_mask_size = fbinfo.blue_mask_size;
multiboot1_info.fb_blue_mask_shift = fbinfo.blue_mask_shift;
} else if (header.fb_mode == 1) {
nofb:;
#if uefi == 1
panic("multiboot1: Cannot use text mode with UEFI.");
#elif bios == 1
size_t rows, cols;
init_vga_textmode(&rows, &cols, false);
multiboot1_info.fb_addr = 0xB8000;
multiboot1_info.fb_addr = 0xb8000;
multiboot1_info.fb_width = cols;
multiboot1_info.fb_height = rows;
multiboot1_info.fb_bpp = 16;

154
stage23/protos/multiboot2.c
View File

@ -18,11 +18,11 @@
#include <lib/blib.h>
#include <drivers/vga_textmode.h>
static struct multiboot_header* load_multiboot2_header(uint8_t* kernel) {
struct multiboot_header* ptr = {0};
static struct multiboot_header *load_multiboot2_header(uint8_t *kernel) {
struct multiboot_header *ptr = NULL;
struct multiboot_header header;
size_t header_offset = 0;
size_t header_offset;
for (header_offset = 0; header_offset < MULTIBOOT_SEARCH; header_offset += MULTIBOOT_HEADER_ALIGN) {
uint32_t v;
@ -39,9 +39,11 @@ static struct multiboot_header* load_multiboot2_header(uint8_t* kernel) {
}
if (ptr->magic != MULTIBOOT2_HEADER_MAGIC) {
panic("multiboot2: could not find header");
} else if (ptr->magic + ptr->architecture + ptr->checksum + ptr->header_length) {
panic("mutliboot2: header checksum is invalid");
panic("multiboot2: Could not find header");
}
if (ptr->magic + ptr->architecture + ptr->checksum + ptr->header_length) {
panic("mutliboot2: Header checksum is invalid");
}
return ptr;
@ -49,9 +51,9 @@ static struct multiboot_header* load_multiboot2_header(uint8_t* kernel) {
/// Returns the size required to store the multiboot2 info.
static size_t get_multiboot2_info_size(
char* cmdline,
char *cmdline,
size_t modules_size,
struct elf_section_hdr_info* section_hdr_info
struct elf_section_hdr_info *section_hdr_info
) {
return ALIGN_UP(sizeof(struct multiboot2_start_tag), MULTIBOOT_TAG_ALIGN) + // start
ALIGN_UP(strlen(cmdline) + 1 + offsetof(struct multiboot_tag_string, string), MULTIBOOT_TAG_ALIGN) + // cmdline
@ -76,19 +78,19 @@ void multiboot2_load(char *config, char* cmdline) {
if (kernel_path == NULL)
panic("multiboot2: KERNEL_PATH not specified");
print("multiboot2: loading kernel `%s`...\n", kernel_path);
print("multiboot2: Loading kernel `%s`...\n", kernel_path);
if (!uri_open(kernel_file, kernel_path))
panic("multiboot2: failed to open kernel with path `%s`. Is the path correct?", kernel_path);
panic("multiboot2: Failed to open kernel with path `%s`. Is the path correct?", kernel_path);
uint8_t *kernel = freadall(kernel_file, MEMMAP_BOOTLOADER_RECLAIMABLE);
struct multiboot_header* header = load_multiboot2_header(kernel);
uint8_t *kernel = freadall(kernel_file, MEMMAP_KERNEL_AND_MODULES);
struct multiboot_header *header = load_multiboot2_header(kernel);
uint32_t entry_point;
uint32_t kernel_top;
int bits = elf_bits(kernel);
struct elf_section_hdr_info* section_hdr_info;
struct elf_section_hdr_info *section_hdr_info;
switch (bits) {
case 32:
@ -114,29 +116,24 @@ void multiboot2_load(char *config, char* cmdline) {
panic("multiboot2: invalid ELF file bitness");
}
print("multiboot2: found kernel entry point at: %x\n", entry_point);
struct multiboot_header_tag_framebuffer *fbtag = NULL;
bool is_new_acpi_required = false;
// Iterate through the entries...
for (struct multiboot_header_tag* tag = (struct multiboot_header_tag*)(header + 1); // header + 1 to skip the header struct.
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))) {
for (struct multiboot_header_tag *tag = (struct multiboot_header_tag*)(header + 1); // header + 1 to skip the header struct.
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);
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];
bool is_required = !(tag->flags & MULTIBOOT_HEADER_TAG_OPTIONAL);
switch(r) {
switch (r) {
// We already support the following requests:
case MULTIBOOT_TAG_TYPE_CMDLINE:
case MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME:
@ -146,25 +143,25 @@ void multiboot2_load(char *config, char* cmdline) {
case MULTIBOOT_TAG_TYPE_FRAMEBUFFER:
case MULTIBOOT_TAG_TYPE_ELF_SECTIONS:
break;
case MULTIBOOT_TAG_TYPE_ACPI_NEW: is_new_acpi_required = is_required; break;
default: {
case MULTIBOOT_TAG_TYPE_ACPI_NEW:
is_new_acpi_required = is_required;
break;
default:
if (!(request->flags & MULTIBOOT_HEADER_TAG_OPTIONAL))
panic("multiboot2: requested tag `%d` which is not supported", r);
} break;
panic("multiboot2: Requested tag `%d` which is not supported", r);
break;
}
}
} break;
break;
}
case MULTIBOOT_HEADER_TAG_FRAMEBUFFER: {
fbtag = (struct multiboot_header_tag_framebuffer*)tag;
} break;
fbtag = (struct multiboot_header_tag_framebuffer *)tag;
break;
}
// We always align the modules ;^)
case MULTIBOOT_HEADER_TAG_MODULE_ALIGN: break;
default: panic("multiboot2: unknown tag type");
default: panic("multiboot2: Unknown header tag type");
}
}
@ -175,7 +172,7 @@ void multiboot2_load(char *config, char* cmdline) {
if (config_get_value(config, modules_size, "MODULE_PATH") == NULL)
break;
char* module_cmdline = config_get_value(config, modules_size, "MODULE_STRING");
char *module_cmdline = config_get_value(config, modules_size, "MODULE_STRING");
if (module_cmdline == NULL) {
module_cmdline = "";
}
@ -185,16 +182,19 @@ void multiboot2_load(char *config, char* cmdline) {
size_t mb2_info_size = get_multiboot2_info_size(cmdline, modules_size, section_hdr_info);
size_t info_idx = 0;
uint8_t* mb2_info = ext_mem_alloc(mb2_info_size);
uint8_t *mb2_info = conv_mem_alloc(mb2_info_size);
struct multiboot2_start_tag* mbi_start = (struct multiboot2_start_tag*)mb2_info;
struct multiboot2_start_tag* mbi_start = (struct multiboot2_start_tag *)mb2_info;
info_idx += sizeof(struct multiboot2_start_tag);
mbi_start->size = mb2_info_size;
mbi_start->reserved = 0x00;
//////////////////////////////////////////////
// Create modules tag
//////////////////////////////////////////////
for (size_t i = 0; i < n_modules; i++) {
char* module_path = config_get_value(config, i, "MODULE_PATH");
char *module_path = config_get_value(config, i, "MODULE_PATH");
if (module_path == NULL)
panic("multiboot2: Module disappeared unexpectedly");
@ -204,8 +204,8 @@ void multiboot2_load(char *config, char* cmdline) {
if (!uri_open(&f, module_path))
panic("multiboot2: Failed to open module with path `%s`. Is the path correct?", module_path);
char* module_cmdline = config_get_value(config, i, "MODULE_STRING");
void* module_addr = (void *)(uintptr_t)ALIGN_UP(kernel_top, 4096);
char *module_cmdline = config_get_value(config, i, "MODULE_STRING");
void *module_addr = (void *)(uintptr_t)ALIGN_UP(kernel_top, 4096);
// Module commandline can be null, so we guard against that and make the
// string "".
@ -219,7 +219,7 @@ void multiboot2_load(char *config, char* cmdline) {
kernel_top = (uintptr_t)module_addr + f.size;
fread(&f, module_addr, 0, f.size);
struct multiboot_tag_module* module_tag = (struct multiboot_tag_module*)(mb2_info + info_idx);
struct multiboot_tag_module *module_tag = (struct multiboot_tag_module *)(mb2_info + info_idx);
module_tag->type = MULTIBOOT_TAG_TYPE_MODULE;
module_tag->size = sizeof(struct multiboot_tag_module) + strlen(module_cmdline) + 1;
@ -243,7 +243,7 @@ void multiboot2_load(char *config, char* cmdline) {
//////////////////////////////////////////////
{
uint32_t size = strlen(cmdline) + 1 + offsetof(struct multiboot_tag_string, string);
struct multiboot_tag_string* tag = (struct multiboot_tag_string*)(mb2_info + info_idx);
struct multiboot_tag_string *tag = (struct multiboot_tag_string *)(mb2_info + info_idx);
tag->type = MULTIBOOT_TAG_TYPE_CMDLINE;
tag->size = size;
@ -258,7 +258,7 @@ void multiboot2_load(char *config, char* cmdline) {
{
char brand[] = "Limine";
uint32_t size = sizeof(brand) + offsetof(struct multiboot_tag_string, string);
struct multiboot_tag_string* tag = (struct multiboot_tag_string*)(mb2_info + info_idx);
struct multiboot_tag_string *tag = (struct multiboot_tag_string *)(mb2_info + info_idx);
tag->type = MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME;
tag->size = size;
@ -282,27 +282,36 @@ void multiboot2_load(char *config, char* cmdline) {
if (resolution != NULL)
parse_resolution(&req_width, &req_height, &req_bpp, resolution);
struct multiboot_tag_framebuffer *tag = (struct multiboot_tag_framebuffer *)(mb2_info + info_idx);
struct fb_info fbinfo;
if (!fb_init(&fbinfo, req_width, req_height, req_bpp))
panic("mutltiboot2: Unable to set video mode");
if (!fb_init(&fbinfo, req_width, req_height, req_bpp)) {
size_t rows, cols;
init_vga_textmode(&rows, &cols, false);
struct multiboot_tag_framebuffer* tag = (struct multiboot_tag_framebuffer*)(mb2_info + info_idx);
tag->common.framebuffer_addr = 0xb8000;
tag->common.framebuffer_pitch = 2 * cols;
tag->common.framebuffer_width = cols;
tag->common.framebuffer_height = rows;
tag->common.framebuffer_bpp = 16;
tag->common.framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT;
} else {
tag->common.type = MULTIBOOT_TAG_TYPE_FRAMEBUFFER;
tag->common.size = sizeof(struct multiboot_tag_framebuffer);
tag->common.framebuffer_addr = fbinfo.framebuffer_addr;
tag->common.framebuffer_pitch = fbinfo.framebuffer_pitch;
tag->common.framebuffer_width = fbinfo.framebuffer_width;
tag->common.framebuffer_height = fbinfo.framebuffer_height;
tag->common.framebuffer_bpp = fbinfo.framebuffer_bpp;
tag->common.framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_RGB; // We only support RGB for VBE
tag->common.type = MULTIBOOT_TAG_TYPE_FRAMEBUFFER;
tag->common.size = sizeof(struct multiboot_tag_framebuffer);
tag->common.framebuffer_addr = fbinfo.framebuffer_addr;
tag->common.framebuffer_pitch = fbinfo.framebuffer_pitch;
tag->common.framebuffer_width = fbinfo.framebuffer_width;
tag->common.framebuffer_height = fbinfo.framebuffer_height;
tag->common.framebuffer_bpp = fbinfo.framebuffer_bpp;
tag->common.framebuffer_type = MULTIBOOT_FRAMEBUFFER_TYPE_RGB; // We only support RGB for VBE
tag->framebuffer_red_field_position = fbinfo.red_mask_shift;
tag->framebuffer_red_mask_size = fbinfo.red_mask_size;
tag->framebuffer_green_field_position = fbinfo.green_mask_shift;
tag->framebuffer_green_mask_size = fbinfo.green_mask_size;
tag->framebuffer_blue_field_position = fbinfo.blue_mask_shift;
tag->framebuffer_blue_mask_size = fbinfo.blue_mask_size;
tag->framebuffer_red_field_position = fbinfo.red_mask_shift;
tag->framebuffer_red_mask_size = fbinfo.red_mask_size;
tag->framebuffer_green_field_position = fbinfo.green_mask_shift;
tag->framebuffer_green_mask_size = fbinfo.green_mask_size;
tag->framebuffer_blue_field_position = fbinfo.blue_mask_shift;
tag->framebuffer_blue_mask_size = fbinfo.blue_mask_size;
}
append_tag(info_idx, &tag->common);
} else {
@ -319,11 +328,11 @@ void multiboot2_load(char *config, char* cmdline) {
// Create new ACPI info tag
//////////////////////////////////////////////
{
void* new_rsdp = acpi_get_rsdp();
void *new_rsdp = acpi_get_rsdp();
if (new_rsdp != NULL) {
uint32_t size = sizeof(struct multiboot_tag_new_acpi) + 36; // XSDP is 36 bytes wide
struct multiboot_tag_new_acpi* tag = (struct multiboot_tag_new_acpi*)(mb2_info + info_idx);
struct multiboot_tag_new_acpi *tag = (struct multiboot_tag_new_acpi *)(mb2_info + info_idx);
tag->type = MULTIBOOT_TAG_TYPE_ACPI_NEW;
tag->size = size;
@ -331,7 +340,7 @@ void multiboot2_load(char *config, char* cmdline) {
memcpy(tag->rsdp, new_rsdp, 36);
append_tag(info_idx, tag);
} else if (is_new_acpi_required) {
panic("multiboot2: new ACPI table not present");
panic("multiboot2: RSDP requested but not found");
}
}
@ -340,7 +349,7 @@ void multiboot2_load(char *config, char* cmdline) {
//////////////////////////////////////////////
{
uint32_t size = sizeof(struct multiboot_tag_elf_sections) + section_hdr_info->section_hdr_size;
struct multiboot_tag_elf_sections* tag = (struct multiboot_tag_elf_sections*)(mb2_info + info_idx);
struct multiboot_tag_elf_sections *tag = (struct multiboot_tag_elf_sections*)(mb2_info + info_idx);
tag->type = MULTIBOOT_TAG_TYPE_ELF_SECTIONS;
tag->size = size;
@ -370,7 +379,7 @@ void multiboot2_load(char *config, char* cmdline) {
// Create the normal memory map tag.
uint32_t mmap_size = sizeof(struct multiboot_tag_mmap) + sizeof(struct multiboot_mmap_entry) * mb_mmap_count;
struct multiboot_tag_mmap* mmap_tag = (struct multiboot_tag_mmap*)(mb2_info + info_idx);
struct multiboot_tag_mmap *mmap_tag = (struct multiboot_tag_mmap *)(mb2_info + info_idx);
mmap_tag->type = MULTIBOOT_TAG_TYPE_MMAP;
mmap_tag->entry_size = sizeof(struct multiboot_mmap_entry);
@ -378,7 +387,7 @@ void multiboot2_load(char *config, char* cmdline) {
mmap_tag->size = mmap_size;
for (size_t i = 0; i < mb_mmap_count; i++) {
struct multiboot_mmap_entry* entry = &mmap_tag->entries[i];
struct multiboot_mmap_entry *entry = &mmap_tag->entries[i];
entry->addr = raw_memmap[i].base;
entry->len = raw_memmap[i].length;
entry->type = raw_memmap[i].type;
@ -399,7 +408,7 @@ void multiboot2_load(char *config, char* cmdline) {
// Create the EFI memory map tag.
uint32_t size = sizeof(struct multiboot_tag_efi_mmap) * efi_mmap_size;
struct multiboot_tag_efi_mmap* mmap_tag = (struct multiboot_tag_efi_mmap*)(mb2_info + info_idx);
struct multiboot_tag_efi_mmap *mmap_tag = (struct multiboot_tag_efi_mmap *)(mb2_info + info_idx);
mmap_tag->type = MULTIBOOT_TAG_TYPE_EFI_MMAP;
mmap_tag->descr_vers = efi_desc_ver;
@ -416,15 +425,14 @@ void multiboot2_load(char *config, char* cmdline) {
// Create end tag
//////////////////////////////////////////////
{
struct multiboot_tag* end_tag = (struct multiboot_tag*)(mb2_info + info_idx);
struct multiboot_tag *end_tag = (struct multiboot_tag *)(mb2_info + info_idx);
end_tag->type = MULTIBOOT_TAG_TYPE_END;
end_tag->size = sizeof(struct multiboot_tag);
append_tag(info_idx, end_tag);
}
mbi_start->size = mb2_info_size;
mbi_start->reserved = 0x00;
pic_flush();
common_spinup(multiboot2_spinup_32, 2,
entry_point, (uint32_t)(uintptr_t)mbi_start);