:: commit 7ff777ef02e06bf9a69a8952b09e463326e0c62d
pmm: Backport fa6f6077 and 74a3a1c6
diff --git a/common/mm/pmm.h b/common/mm/pmm.h
index 55421ae0..6d408908 100644
--- a/common/mm/pmm.h
+++ b/common/mm/pmm.h
@@ -21,7 +21,6 @@ struct memmap_entry {
#define MEMMAP_KERNEL_AND_MODULES 0x1001
#define MEMMAP_FRAMEBUFFER 0x1002
#define MEMMAP_EFI_RECLAIMABLE 0x2000
-#define MEMMAP_EFI_BOOTSERVICES 0x2001
struct meminfo {
size_t uppermem;
@@ -49,6 +48,8 @@ void init_memmap(void);
struct memmap_entry *get_memmap(size_t *entries);
struct memmap_entry *get_raw_memmap(size_t *entry_count);
void print_memmap(struct memmap_entry *mm, size_t size);
+bool memmap_alloc_range_in(struct memmap_entry *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);
diff --git a/common/mm/pmm.s2.c b/common/mm/pmm.s2.c
index c2936930..b011082e 100644
--- a/common/mm/pmm.s2.c
+++ b/common/mm/pmm.s2.c
@@ -84,8 +84,6 @@ static const char *memmap_type(uint32_t type) {
return "Kernel/Modules";
case MEMMAP_EFI_RECLAIMABLE:
return "EFI reclaimable";
- case MEMMAP_EFI_BOOTSERVICES:
- return "EFI boot services";
default:
return "???";
}
@@ -118,10 +116,6 @@ static bool align_entry(uint64_t *base, uint64_t *length) {
return true;
}
-static bool sanitiser_keep_first_page = false;
-
-#define MEMMAP_DROP_LATER ((uint32_t)-1)
-
static void sanitise_entries(struct memmap_entry *m, size_t *_count, bool align_entries) {
size_t count = *_count;
@@ -144,14 +138,6 @@ static void sanitise_entries(struct memmap_entry *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.");
}
@@ -176,22 +162,12 @@ static void sanitise_entries(struct memmap_entry *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)
continue;
- if (!sanitiser_keep_first_page && m[i].base < 0x1000) {
+ if (m[i].base < 0x1000) {
if (m[i].base + m[i].length <= 0x1000) {
goto del_mm1;
}
@@ -356,7 +332,7 @@ void init_memmap(void) {
our_type = MEMMAP_RESERVED; break;
case EfiBootServicesCode:
case EfiBootServicesData:
- our_type = MEMMAP_EFI_BOOTSERVICES; break;
+ our_type = MEMMAP_EFI_RECLAIMABLE; break;
case EfiACPIReclaimMemory:
our_type = MEMMAP_ACPI_RECLAIMABLE; break;
case EfiACPIMemoryNVS:
@@ -447,104 +423,62 @@ void pmm_reclaim_uefi_mem(void) {
struct memmap_entry *recl = ext_mem_alloc(recl_i * sizeof(struct memmap_entry));
- {
- size_t recl_j = 0;
- for (size_t i = 0; i < memmap_entries; i++) {
- if (memmap[i].type == MEMMAP_EFI_RECLAIMABLE) {
- recl[recl_j++] = memmap[i];
- }
+ for (size_t i = 0, j = 0; i < memmap_entries; i++) {
+ if (memmap[i].type == MEMMAP_EFI_RECLAIMABLE) {
+ recl[j++] = memmap[i];
}
}
-another_recl:;
- // Punch holes in our EFI reclaimable entry for every EFI area which is
- // boot services or conventional that fits within
- size_t efi_mmap_entry_count = efi_mmap_size / efi_desc_size;
- for (size_t i = 0; i < efi_mmap_entry_count; i++) {
- EFI_MEMORY_DESCRIPTOR *entry = (void *)efi_mmap + i * efi_desc_size;
-
- uint64_t base = recl->base;
- uint64_t top = base + recl->length;
- uint64_t efi_base = entry->PhysicalStart;
- uint64_t efi_size = entry->NumberOfPages * 4096;
-
- if (efi_base < base) {
- if (efi_size <= base - efi_base)
- continue;
- efi_size -= base - efi_base;
- efi_base = base;
- }
-
- uint64_t efi_top = efi_base + efi_size;
+ for (size_t ri = 0; ri < recl_i; ri++) {
+ struct memmap_entry *r = &recl[ri];
- if (efi_top > top) {
- if (efi_size <= efi_top - top)
- continue;
- efi_size -= efi_top - top;
- efi_top = top;
- }
-
- // Sanity check
- if (!(efi_base >= base && efi_base < top
- && efi_top > base && efi_top <= top))
- continue;
-
- uint32_t our_type;
- switch (entry->Type) {
- case EfiBootServicesCode:
- case EfiBootServicesData:
- case EfiConventionalMemory:
- our_type = MEMMAP_USABLE; break;
- case EfiACPIReclaimMemory:
- our_type = MEMMAP_ACPI_RECLAIMABLE; break;
- case EfiACPIMemoryNVS:
- our_type = MEMMAP_ACPI_NVS; break;
- default:
- our_type = MEMMAP_RESERVED; break;
- }
+ // Punch holes in our EFI reclaimable entry for every EFI area which is
+ // boot services or conventional that fits within
+ size_t efi_mmap_entry_count = efi_mmap_size / efi_desc_size;
+ for (size_t i = 0; i < efi_mmap_entry_count; i++) {
+ EFI_MEMORY_DESCRIPTOR *entry = (void *)efi_mmap + i * efi_desc_size;
- memmap_alloc_range(efi_base, efi_size, our_type, false, true, false, true);
- }
+ uint64_t base = r->base;
+ uint64_t top = base + r->length;
+ uint64_t efi_base = entry->PhysicalStart;
+ uint64_t efi_size = entry->NumberOfPages * 4096;
- if (--recl_i > 0) {
- recl++;
- goto another_recl;
- }
+ if (efi_base < base) {
+ if (efi_size <= base - efi_base)
+ continue;
+ efi_size -= base - efi_base;
+ efi_base = base;
+ }
- // Ensure the boot services are still boot services, or free, in
- // the EFI memmap, and disallow allocations since our stack and page tables
- // are placed in this newly freed memory.
- for (size_t i = 0; i < memmap_entries; i++) {
- if (memmap[i].type != MEMMAP_EFI_BOOTSERVICES)
- continue;
+ uint64_t efi_top = efi_base + efi_size;
- // Go through EFI memmap and ensure this entry fits within a boot services
- // or conventional entry
- size_t entry_count = efi_mmap_size / efi_desc_size;
+ if (efi_top > top) {
+ if (efi_size <= efi_top - top)
+ continue;
+ efi_size -= efi_top - top;
+ efi_top = top;
+ }
- for (size_t j = 0; j < entry_count; j++) {
- EFI_MEMORY_DESCRIPTOR *entry = (void *)efi_mmap + j * efi_desc_size;
+ // Sanity check
+ if (!(efi_base >= base && efi_base < top
+ && efi_top > base && efi_top <= top))
+ continue;
+ uint32_t our_type;
switch (entry->Type) {
case EfiBootServicesCode:
case EfiBootServicesData:
case EfiConventionalMemory:
- break;
+ our_type = MEMMAP_USABLE; break;
+ case EfiACPIReclaimMemory:
+ our_type = MEMMAP_ACPI_RECLAIMABLE; break;
+ case EfiACPIMemoryNVS:
+ our_type = MEMMAP_ACPI_NVS; break;
default:
- continue;
+ our_type = MEMMAP_RESERVED; break;
}
- uintptr_t base = memmap[i].base;
- uintptr_t top = base + memmap[i].length;
- uintptr_t efi_base = entry->PhysicalStart;
- uintptr_t efi_size = entry->NumberOfPages * 4096;
- uintptr_t efi_top = efi_base + efi_size;
-
- if (!(base >= efi_base && base < efi_top
- && top > efi_base && top <= efi_top))
- continue;
-
- memmap[i].type = MEMMAP_USABLE;
+ memmap_alloc_range_in(memmap, &memmap_entries, efi_base, efi_size, our_type, 0, true, false, false);
}
}
@@ -618,10 +552,7 @@ struct memmap_entry *get_raw_memmap(size_t *entry_count) {
mmap[i].type = our_type;
}
- bool s_old = sanitiser_keep_first_page;
- sanitiser_keep_first_page = true;
sanitise_entries(mmap, &mmap_count, false);
- sanitiser_keep_first_page = s_old;
*entry_count = mmap_count;
return mmap;
@@ -715,19 +646,22 @@ struct meminfo mmap_get_info(size_t mmap_count, struct memmap_entry *mmap) {
return info;
}
-static bool pmm_new_entry(uint64_t base, uint64_t length, uint32_t type) {
+static bool pmm_new_entry(struct memmap_entry *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;
}
@@ -735,30 +669,30 @@ 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 memmap_entry *new_entry = &memmap[memmap_entries++];
+ struct memmap_entry *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;
@@ -766,19 +700,23 @@ 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 memmap_entry *target = &memmap[memmap_entries++];
+ struct memmap_entry *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 memmap_entry *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;
@@ -788,18 +726,18 @@ 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;
}
}
@@ -812,11 +750,16 @@ 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);
+}
