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-rw-r--r--payloads/libpayload/arch/arm64/mmu.c60
1 files changed, 35 insertions, 25 deletions
diff --git a/payloads/libpayload/arch/arm64/mmu.c b/payloads/libpayload/arch/arm64/mmu.c
index 85f3ac9a56..123b9b1576 100644
--- a/payloads/libpayload/arch/arm64/mmu.c
+++ b/payloads/libpayload/arch/arm64/mmu.c
@@ -54,7 +54,7 @@ static uint8_t ttb_buffer[TTB_DEFAULT_SIZE] __attribute__((aligned(GRANULE_SIZE)
* the DMA buffer is being placed in a sane location and does not overlap any of
* the used mem ranges.
*/
-struct mmu_ranges usedmem_ranges;
+static struct mmu_ranges usedmem_ranges;
static const uint64_t level_to_addr_mask[] = {
L1_ADDR_MASK,
@@ -427,6 +427,29 @@ static int mmu_is_dma_range_valid(uint64_t dma_base,
}
/*
+ * Func: mmu_add_memrange
+ * Desc: Adds a new memory range
+ */
+static struct mmu_memrange* mmu_add_memrange(struct mmu_ranges *r,
+ uint64_t base, uint64_t size,
+ uint64_t type)
+{
+ struct mmu_memrange *curr = NULL;
+ int i = r->used;
+
+ if (i < ARRAY_SIZE(r->entries)) {
+ curr = &r->entries[i];
+ curr->base = base;
+ curr->size = size;
+ curr->type = type;
+
+ r->used = i + 1;
+ }
+
+ return curr;
+}
+
+/*
* Func: mmu_add_dma_range
* Desc: Add a memrange for dma operations. This is special because we want to
* initialize this memory as non-cacheable. We have a constraint that the DMA
@@ -458,7 +481,7 @@ static struct mmu_memrange* mmu_add_dma_range(struct mmu_ranges *mmu_ranges)
* We need to ensure that we do not step over payload regions or
* the coreboot_table
*/
- do {
+ while (1) {
/*
* If end_addr is aligned to GRANULE_SIZE,
* then base_addr will be too.
@@ -472,7 +495,13 @@ static struct mmu_memrange* mmu_add_dma_range(struct mmu_ranges *mmu_ranges)
if (base_addr < r[i].base)
break;
- } while (mmu_is_dma_range_valid(base_addr, end_addr) == 0);
+
+ if (mmu_is_dma_range_valid(base_addr, end_addr))
+ break;
+
+ /* Drop to the next address. */
+ end_addr -= 1;
+ }
if (base_addr < r[i].base)
continue;
@@ -557,6 +586,9 @@ struct mmu_memrange *mmu_init_ranges_from_sysinfo(struct memrange *cb_ranges,
{
struct mmu_memrange *dma_range;
+ /* Initialize mmu_ranges to contain no entries. */
+ mmu_ranges->used = 0;
+
/* Extract ranges from memrange in lib_sysinfo */
mmu_extract_ranges(cb_ranges, ncb, mmu_ranges);
@@ -570,28 +602,6 @@ struct mmu_memrange *mmu_init_ranges_from_sysinfo(struct memrange *cb_ranges,
}
/*
- * Func: mmu_add_memrange
- * Desc: Adds a new memory range
- */
-struct mmu_memrange* mmu_add_memrange(struct mmu_ranges *r, uint64_t base,
- uint64_t size, uint64_t type)
-{
- struct mmu_memrange *curr = NULL;
- int i = r->used;
-
- if (i < ARRAY_SIZE(r->entries)) {
- curr = &r->entries[i];
- curr->base = base;
- curr->size = size;
- curr->type = type;
-
- r->used = i + 1;
- }
-
- return curr;
-}
-
-/*
* Func: mmu_presysinfo_memory_used
* Desc: Initializes all the memory used for presysinfo page table
* initialization and enabling of MMU. All these ranges are stored in