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pmm: Make conventional memory allocator work with UEFI

This commit is contained in:
mintsuki 2021-03-07 04:10:44 +01:00
parent 4e55d28777
commit e56df5b3ab
1 changed files with 42 additions and 24 deletions
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66
stage23/mm/pmm.s2.c
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@ -14,6 +14,35 @@
#define MEMMAP_BASE ((size_t)0x100000)
#define MEMMAP_MAX_ENTRIES 256
#if defined (bios)
extern symbol bss_end;
static size_t bump_allocator_base = (size_t)bss_end;
static size_t bump_allocator_limit = 0x70000;
#endif
#if defined (uefi)
static size_t bump_allocator_base = 0x100000;
static size_t bump_allocator_limit = 0x100000;
#endif
void *conv_mem_alloc(size_t count) {
return conv_mem_alloc_aligned(count, 4);
}
void *conv_mem_alloc_aligned(size_t count, size_t alignment) {
size_t new_base = ALIGN_UP(bump_allocator_base, alignment);
void *ret = (void *)new_base;
new_base += count;
if (new_base >= bump_allocator_limit)
panic("Memory allocation failed");
bump_allocator_base = new_base;
// Zero out allocated space
memset(ret, 0, count);
return ret;
}
struct e820_entry_t memmap[MEMMAP_MAX_ENTRIES];
size_t memmap_entries = 0;
@ -258,6 +287,16 @@ void init_memmap(void) {
memmap[memmap_entries].base = entry->PhysicalStart;
memmap[memmap_entries].length = entry->NumberOfPages * 4096;
if (our_type == MEMMAP_USABLE
&& entry->PhysicalStart < bump_allocator_base) {
bump_allocator_base = entry->PhysicalStart;
bump_allocator_limit =
entry->PhysicalStart + entry->NumberOfPages * 4096;
if (bump_allocator_limit > 0x100000)
bump_allocator_limit = 0x100000;
}
memmap_entries++;
}
@ -281,6 +320,9 @@ void init_memmap(void) {
if (status)
panic("AllocatePages %x", status);
}
print("pmm: Conventional mem allocator base: %X\n", bump_allocator_base);
print("pmm: Conventional mem allocator limit: %X\n", bump_allocator_limit);
}
#endif
@ -403,27 +445,3 @@ bool memmap_alloc_range(uint64_t base, uint64_t length, uint32_t type, bool free
return false;
}
#if defined (bios)
extern symbol bss_end;
static size_t bump_allocator_base = (size_t)bss_end;
static size_t bump_allocator_limit = 0x70000;
void *conv_mem_alloc(size_t count) {
return conv_mem_alloc_aligned(count, 4);
}
void *conv_mem_alloc_aligned(size_t count, size_t alignment) {
size_t new_base = ALIGN_UP(bump_allocator_base, alignment);
void *ret = (void *)new_base;
new_base += count;
if (new_base >= bump_allocator_limit)
panic("Memory allocation failed");
bump_allocator_base = new_base;
// Zero out allocated space
memset(ret, 0, count);
return ret;
}
#endif