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bootmem: Clarify usage with bounce-buffer 

Add bootmem_targets_usable_with_bounce() to handle
cases of payload loading via bounce-buffer.

Change-Id: I9ebbc621f8810c0317d7c97c6b4cdd41527ddcbb
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/26985
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Kyösti Mälkki 2018-06-08 20:19:21 +03:00 committed by Patrick Georgi
parent 43fc1aee4d
commit d022718001
2 changed files with 26 additions and 3 deletions
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5
src/include/bootmem.h
View File

@ -97,6 +97,11 @@ bool bootmem_walk(range_action_t action, void *arg);
/* Return 1 if region targets usable RAM, 0 otherwise. */
int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size);
/* Return 1 if region targets usable RAM, and we allow memory ranges
* with type >BM_MEM_OS_CUTOFF to be overwritten at the time we jump
* to payload. 0 otherwise. */
int bootmem_region_usable_with_bounce(uint64_t start, uint64_t size);
/* Allocate a temporary buffer from the unused RAM areas. */
void *bootmem_allocate_buffer(size_t size);

24
src/lib/bootmem.c
View File

@ -201,12 +201,12 @@ bool bootmem_walk(range_action_t action, void *arg)
return false;
}
int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size)
static int bootmem_region_targets_ram(uint64_t start, uint64_t end,
struct memranges *bm)
{
const struct range_entry *r;
uint64_t end = start + size;
memranges_each_entry(r, &bootmem) {
memranges_each_entry(r, bm) {
/* All further bootmem entries are beyond this range. */
if (end <= range_entry_base(r))
break;
@ -219,6 +219,24 @@ int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size)
return 0;
}
/* Common testcase for loading any segments to bootmem.
* Returns 1 if the requested memory range is all tagged as type BM_MEM_RAM.
* Otherwise returns 0.
*/
int bootmem_region_targets_usable_ram(uint64_t start, uint64_t size)
{
return bootmem_region_targets_ram(start, start + size, &bootmem);
}
/* Special testcase to use when loading payload segments when bounce-buffer is
* supported. Memory ranges tagged with >BM_MEM_OS_CUTOFF may be overwritten at
* the time we jump to payload.
*/
int bootmem_region_usable_with_bounce(uint64_t start, uint64_t size)
{
return bootmem_region_targets_ram(start, start + size, &bootmem_os);
}
void *bootmem_allocate_buffer(size_t size)
{
const struct range_entry *r;