ARM: mm: Introduce virt_to_idmap() with an arch hook
On some PAE systems (e.g. TI Keystone), memory is above the
32-bit addressable limit, and the interconnect provides an
aliased view of parts of physical memory in the 32-bit addressable
space. This alias is strictly for boot time usage, and is not
otherwise usable because of coherency limitations. On such systems,
the idmap mechanism needs to take this aliased mapping into account.
This patch introduces virt_to_idmap() and a arch function pointer which
can be populated by platform which needs it. Also populate necessary
idmap spots with now available virt_to_idmap(). Avoided #ifdef approach
to be compatible with multi-platform builds.
Most architecture won't touch it and in that case virt_to_idmap()
fall-back to existing virt_to_phys() macro.
Cc: Russell King <[email protected]>
Acked-by: Nicolas Pitre <[email protected]>
Signed-off-by: Santosh Shilimkar <[email protected]>
diff --git a/arch/arm/mm/idmap.c b/arch/arm/mm/idmap.c
index 83cb3ac..c0a1e48 100644
--- a/arch/arm/mm/idmap.c
+++ b/arch/arm/mm/idmap.c
@@ -10,6 +10,7 @@
#include <asm/system_info.h>
pgd_t *idmap_pgd;
+phys_addr_t (*arch_virt_to_idmap) (unsigned long x);
#ifdef CONFIG_ARM_LPAE
static void idmap_add_pmd(pud_t *pud, unsigned long addr, unsigned long end,
@@ -67,8 +68,8 @@
unsigned long addr, end;
unsigned long next;
- addr = virt_to_phys(text_start);
- end = virt_to_phys(text_end);
+ addr = virt_to_idmap(text_start);
+ end = virt_to_idmap(text_end);
prot |= PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AF;
