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kmalloc: support for PRAM0 arena

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PRAM0 is mostly standard memory but it can only be read from and written
to with 32-bit memory accesses.
This commit is contained in:
Lephe 2024-02-04 22:10:16 +01:00
parent e50769c824
commit d8005b5d49
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1 changed files with 10 additions and 7 deletions
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17
src/kmalloc/arena_gint.c
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@ -43,17 +43,17 @@
link, then one block_t pointer to the next link with LSB=1 link, then one block_t pointer to the next link with LSB=1
* For a larger block, the footer has a 4-byte block size, then a pointer to * For a larger block, the footer has a 4-byte block size, then a pointer to
the previous link, and a pointer to the next link with LSB=0. */ the previous link, and a pointer to the next link with LSB=0. */
typedef struct { typedef volatile struct {
uint :5; uint32_t :5;
/* Marks the last block of the sequence */ /* Marks the last block of the sequence */
uint last: 1; uint32_t last: 1;
/* Whether the block is used; in general this can be kept implicit, but /* Whether the block is used; in general this can be kept implicit, but
it has to be specified for the last block */ it has to be specified for the last block */
uint used: 1; uint32_t used: 1;
/* Boundary tag, vital to implement way #2 to merge adjacent blocks */ /* Boundary tag, vital to implement way #2 to merge adjacent blocks */
uint previous_used: 1; uint32_t previous_used: 1;
/* Block size in bytes. */ /* Block size in bytes. */
uint size: 24; uint32_t size: 24;
} block_t; } block_t;
typedef kmalloc_gint_stats_t stats_t; typedef kmalloc_gint_stats_t stats_t;
@ -435,7 +435,10 @@ void kmalloc_init_arena(kmalloc_arena_t *a, bool enable_statistics)
index->stats = (void *)a->start + sizeof(index_t); index->stats = (void *)a->start + sizeof(index_t);
entry_block = (void *)index->stats + sizeof(stats_t); entry_block = (void *)index->stats + sizeof(stats_t);
memset(index->stats, 0, sizeof(stats_t)); /* Manual 4-byte memset to allow PRAM0 arena */
for(uint i = 0; i < sizeof(stats_t) / 4; i++)
((uint32_t *)index->stats)[i] = 0;
_Static_assert((sizeof(stats_t) & 3) == 0);
} }
else else
{ {