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lib: lmb: extend lmb for checks at load time

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This adds two new functions, lmb_alloc_addr and
lmb_get_unreserved_size.

lmb_alloc_addr behaves like lmb_alloc, but it tries to allocate a
pre-specified address range. Unlike lmb_reserve, this address range
must be inside one of the memory ranges that has been set up with
lmb_add.

lmb_get_unreserved_size returns the number of bytes that can be
used up to the next reserved region or the end of valid ram. This
can be 0 if the address passed is reserved.

Added test for these new functions.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
This commit is contained in:
Simon Goldschmidt
2019-01-14 22:38:18 +01:00
committed by Tom Rini
parent e2237a2c26
commit 4cc8af8037
3 changed files with 258 additions and 0 deletions
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53
lib/lmb.c
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@@ -313,6 +313,59 @@ phys_addr_t __lmb_alloc_base(struct lmb *lmb, phys_size_t size, ulong align, phy
return 0;
}
/*
* Try to allocate a specific address range: must be in defined memory but not
* reserved
*/
phys_addr_t lmb_alloc_addr(struct lmb *lmb, phys_addr_t base, phys_size_t size)
{
long j;
/* Check if the requested address is in one of the memory regions */
j = lmb_overlaps_region(&lmb->memory, base, size);
if (j >= 0) {
/*
* Check if the requested end address is in the same memory
* region we found.
*/
if (lmb_addrs_overlap(lmb->memory.region[j].base,
lmb->memory.region[j].size, base + size -
1, 1)) {
/* ok, reserve the memory */
if (lmb_reserve(lmb, base, size) >= 0)
return base;
}
}
return 0;
}
/* Return number of bytes from a given address that are free */
phys_size_t lmb_get_unreserved_size(struct lmb *lmb, phys_addr_t addr)
{
int i;
long j;
/* check if the requested address is in the memory regions */
j = lmb_overlaps_region(&lmb->memory, addr, 1);
if (j >= 0) {
for (i = 0; i < lmb->reserved.cnt; i++) {
if (addr < lmb->reserved.region[i].base) {
/* first reserved range > requested address */
return lmb->reserved.region[i].base - addr;
}
if (lmb->reserved.region[i].base +
lmb->reserved.region[i].size > addr) {
/* requested addr is in this reserved range */
return 0;
}
}
/* if we come here: no reserved ranges above requested addr */
return lmb->memory.region[lmb->memory.cnt - 1].base +
lmb->memory.region[lmb->memory.cnt - 1].size - addr;
}
return 0;
}
int lmb_is_reserved(struct lmb *lmb, phys_addr_t addr)
{
int i;