mirror of
https://github.com/torvalds/linux.git
synced 2025-04-12 16:47:42 +00:00
e4da8249cf
Convert the explicit relocated lowcore alternative type to a more generic machine feature. This only reduces the number of alternative types, but has no impact on code generation. Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
48 lines
1.0 KiB
C
48 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
#include <linux/pgtable.h>
|
|
#include <asm/abs_lowcore.h>
|
|
#include <asm/sections.h>
|
|
|
|
unsigned long __bootdata_preserved(__abs_lowcore);
|
|
|
|
int abs_lowcore_map(int cpu, struct lowcore *lc, bool alloc)
|
|
{
|
|
unsigned long addr = __abs_lowcore + (cpu * sizeof(struct lowcore));
|
|
unsigned long phys = __pa(lc);
|
|
int rc, i;
|
|
|
|
for (i = 0; i < LC_PAGES; i++) {
|
|
rc = __vmem_map_4k_page(addr, phys, PAGE_KERNEL, alloc);
|
|
if (rc) {
|
|
/*
|
|
* Do not unmap allocated page tables in case the
|
|
* allocation was not requested. In such a case the
|
|
* request is expected coming from an atomic context,
|
|
* while the unmap attempt might sleep.
|
|
*/
|
|
if (alloc) {
|
|
for (--i; i >= 0; i--) {
|
|
addr -= PAGE_SIZE;
|
|
vmem_unmap_4k_page(addr);
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
addr += PAGE_SIZE;
|
|
phys += PAGE_SIZE;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void abs_lowcore_unmap(int cpu)
|
|
{
|
|
unsigned long addr = __abs_lowcore + (cpu * sizeof(struct lowcore));
|
|
int i;
|
|
|
|
for (i = 0; i < LC_PAGES; i++) {
|
|
vmem_unmap_4k_page(addr);
|
|
addr += PAGE_SIZE;
|
|
}
|
|
}
|