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pmm: General tyding up of pmm code (2)

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This commit is contained in:
mintsuki 2022-08-11 20:20:16 +02:00
parent fa6f607769
commit 74a3a1c6b6
2 changed files with 38 additions and 57 deletions
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2
common/mm/pmm.h
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@ -39,6 +39,8 @@ void init_memmap(void);
struct e820_entry_t *get_memmap(size_t *entries);
struct e820_entry_t *get_raw_memmap(size_t *entry_count);
void print_memmap(struct e820_entry_t *mm, size_t size);
bool memmap_alloc_range_in(struct e820_entry_t *m, size_t *_count,
uint64_t base, uint64_t length, uint32_t type, uint32_t overlay_type, bool do_panic, bool simulation, bool new_entry);
bool memmap_alloc_range(uint64_t base, uint64_t length, uint32_t type, uint32_t overlay_type, bool panic, bool simulation, bool new_entry);
void pmm_randomise_memory(void);

93
common/mm/pmm.s2.c
View File

@ -116,8 +116,6 @@ static bool align_entry(uint64_t *base, uint64_t *length) {
return true;
}
#define MEMMAP_DROP_LATER ((uint32_t)-1)
static void sanitise_entries(struct e820_entry_t *m, size_t *_count, bool align_entries) {
size_t count = *_count;
@ -140,14 +138,6 @@ static void sanitise_entries(struct e820_entry_t *m, size_t *_count, bool align_
if ( (res_base >= base && res_base < top)
&& (res_top >= base && res_top < top) ) {
// Drop the entry entirely if usable
if (m[j].type == MEMMAP_USABLE) {
m[j].type = MEMMAP_DROP_LATER;
}
if (m[j].type == MEMMAP_DROP_LATER) {
continue;
}
// TODO actually handle splitting off usable chunks
panic(false, "A non-usable memory map entry is inside a usable section.");
}
@ -172,16 +162,6 @@ static void sanitise_entries(struct e820_entry_t *m, size_t *_count, bool align_
}
}
// Collect "drop later" entries
for (size_t i = 0; i < count; i++) {
if (m[i].type != MEMMAP_DROP_LATER) {
continue;
}
m[i] = m[count - 1];
count--; i--;
}
// Remove 0 length usable entries and usable entries below 0x1000
for (size_t i = 0; i < count; i++) {
if (m[i].type != MEMMAP_USABLE)
@ -493,20 +473,7 @@ static void pmm_reclaim_uefi_mem(struct e820_entry_t *m, size_t *_count) {
our_type = MEMMAP_RESERVED; break;
}
struct e820_entry_t *memmap_save = memmap;
size_t memmap_entries_save = memmap_entries;
memmap = m;
memmap_entries = count;
memmap_alloc_range(efi_base, efi_size, our_type, 0, true, false, false);
count = memmap_entries;
if (memmap_save != memmap) {
memmap = memmap_save;
memmap_entries = memmap_entries_save;
}
memmap_alloc_range_in(m, &count, efi_base, efi_size, our_type, 0, true, false, false);
}
}
@ -639,19 +606,22 @@ struct meminfo mmap_get_info(size_t mmap_count, struct e820_entry_t *mmap) {
return info;
}
static bool pmm_new_entry(uint64_t base, uint64_t length, uint32_t type) {
static bool pmm_new_entry(struct e820_entry_t *m, size_t *_count,
uint64_t base, uint64_t length, uint32_t type) {
size_t count = *_count;
uint64_t top = base + length;
// Handle overlapping new entries.
for (size_t i = 0; i < memmap_entries; i++) {
uint64_t entry_base = memmap[i].base;
uint64_t entry_top = memmap[i].base + memmap[i].length;
for (size_t i = 0; i < count; i++) {
uint64_t entry_base = m[i].base;
uint64_t entry_top = m[i].base + m[i].length;
// Full overlap
if (base <= entry_base && top >= entry_top) {
// Remove overlapped entry
memmap[i] = memmap[memmap_entries - 1];
memmap_entries--;
m[i] = m[count - 1];
count--;
i--;
continue;
}
@ -659,30 +629,30 @@ static bool pmm_new_entry(uint64_t base, uint64_t length, uint32_t type) {
// Partial overlap (bottom)
if (base <= entry_base && top < entry_top && top > entry_base) {
// Entry gets bottom shaved off
memmap[i].base += top - entry_base;
memmap[i].length -= top - entry_base;
m[i].base += top - entry_base;
m[i].length -= top - entry_base;
continue;
}
// Partial overlap (top)
if (base > entry_base && base < entry_top && top >= entry_top) {
// Entry gets top shaved off
memmap[i].length -= entry_top - base;
m[i].length -= entry_top - base;
continue;
}
// Nested (pain)
if (base > entry_base && top < entry_top) {
// Entry gets top shaved off first
memmap[i].length -= entry_top - base;
m[i].length -= entry_top - base;
// Now we need to create a new entry
if (memmap_entries >= memmap_max_entries)
if (count >= memmap_max_entries)
panic(false, "Memory map exhausted.");
struct e820_entry_t *new_entry = &memmap[memmap_entries++];
struct e820_entry_t *new_entry = &m[count++];
new_entry->type = memmap[i].type;
new_entry->type = m[i].type;
new_entry->base = top;
new_entry->length = entry_top - top;
@ -690,19 +660,23 @@ static bool pmm_new_entry(uint64_t base, uint64_t length, uint32_t type) {
}
}
if (memmap_entries >= memmap_max_entries)
if (count >= memmap_max_entries)
panic(false, "Memory map exhausted.");
struct e820_entry_t *target = &memmap[memmap_entries++];
struct e820_entry_t *target = &m[count++];
target->type = type;
target->base = base;
target->length = length;
*_count = count;
return true;
}
bool memmap_alloc_range(uint64_t base, uint64_t length, uint32_t type, uint32_t overlay_type, bool do_panic, bool simulation, bool new_entry) {
bool memmap_alloc_range_in(struct e820_entry_t *m, size_t *_count,
uint64_t base, uint64_t length, uint32_t type, uint32_t overlay_type, bool do_panic, bool simulation, bool new_entry) {
size_t count = *_count;
if (length == 0)
return true;
@ -712,18 +686,18 @@ bool memmap_alloc_range(uint64_t base, uint64_t length, uint32_t type, uint32_t
uint64_t top = base + length;
for (size_t i = 0; i < memmap_entries; i++) {
if (overlay_type != 0 && memmap[i].type != overlay_type)
for (size_t i = 0; i < count; i++) {
if (overlay_type != 0 && m[i].type != overlay_type)
continue;
uint64_t entry_base = memmap[i].base;
uint64_t entry_top = memmap[i].base + memmap[i].length;
uint64_t entry_base = m[i].base;
uint64_t entry_top = m[i].base + m[i].length;
if (base >= entry_base && base < entry_top && top <= entry_top) {
if (simulation)
return true;
if (pmm_new_entry(base, length, type) == true) {
if (pmm_new_entry(m, &count, base, length, type) == true) {
goto success;
}
}
@ -736,11 +710,16 @@ bool memmap_alloc_range(uint64_t base, uint64_t length, uint32_t type, uint32_t
return false;
}
if (pmm_new_entry(base, length, type) == false) {
if (pmm_new_entry(m, &count, base, length, type) == false) {
return false;
}
success:
sanitise_entries(memmap, &memmap_entries, false);
sanitise_entries(m, &count, false);
*_count = count;
return true;
}
bool memmap_alloc_range(uint64_t base, uint64_t length, uint32_t type, uint32_t overlay_type, bool do_panic, bool simulation, bool new_entry) {
return memmap_alloc_range_in(memmap, &memmap_entries, base, length, type, overlay_type, do_panic, simulation, new_entry);
}