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walk multiboot2 memory map

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This commit is contained in:
Josh Holtrop 2020-10-23 00:47:19 -04:00
parent cbd427b14b
commit bffd652c16
2 changed files with 39 additions and 6 deletions
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26
src/mbinfo.c
View File

@ -26,6 +26,32 @@ static void mbinfo_process_tag(const multiboot2_info_tag_t * tag)
}
break;
case MULTIBOOT2_INFO_MEMORY_MAP:
{
multiboot2_info_memory_map_t * mmap_info =
(multiboot2_info_memory_map_t *)tag;
size_t sz = sizeof(mmap_info->header) +
sizeof(mmap_info->entry_size) +
sizeof(mmap_info->entry_version);
multiboot2_info_memory_map_entry_t * entry = &mmap_info->entries[0];
for (;;)
{
sz += mmap_info->entry_size;
if (sz > mmap_info->header.size)
{
break;
}
if (entry->type == MULTIBOOT2_MEMORY_MAP_TYPE_RAM)
{
klog_printf("Memory region %16lx : %16lx\n",
entry->base_addr,
entry->length);
}
entry = (multiboot2_info_memory_map_entry_t *)((uintptr_t)entry + mmap_info->entry_size);
}
}
break;
case MULTIBOOT2_INFO_FRAMEBUFFER_INFO:
{
multiboot2_info_framebuffer_info_t * fbinfo =

17
src/multiboot2.h
View File

@ -84,16 +84,23 @@ typedef struct {
uint32_t mem_upper;
} multiboot2_info_basic_memory_info_t;
#define MULTIBOOT2_MEMORY_MAP_TYPE_RAM 1u
#define MULTIBOOT2_MEMORY_MAP_TYPE_ACPI 3u
#define MULTIBOOT2_MEMORY_MAP_TYPE_PRESERVE 4u
#define MULTIBOOT2_MEMORY_MAP_TYPE_DEFECTIVE 5u
typedef struct {
multiboot2_info_tag_t header;
uint32_t entry_size;
uint32_t entry_version;
struct {
uint64_t base_addr;
uint64_t length;
uint32_t type;
uint32_t _reserved;
} entries[];
} multiboot2_info_memory_map_entry_t;
typedef struct {
multiboot2_info_tag_t header;
uint32_t entry_size;
uint32_t entry_version;
multiboot2_info_memory_map_entry_t entries[];
} multiboot2_info_memory_map_t;
typedef struct {