Enable D cache before SHA verification and disable it before switching
to kernel.
Since we only map RAM area, therefore currently no printf is allowed
between d-cache enable and disable events. Identity mapping for port
area with device type memory attributes need to be created for printf to
work.
Signed-off-by: Pratyush Anand <panand at redhat.com>
---
purgatory/arch/arm64/purgatory-arm64.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/purgatory/arch/arm64/purgatory-arm64.c b/purgatory/arch/arm64/purgatory-arm64.c
index 3a1c9243bfa2..e045039039b6 100644
--- a/purgatory/arch/arm64/purgatory-arm64.c
+++ b/purgatory/arch/arm64/purgatory-arm64.c
@@ -2,6 +2,7 @@
* ARM64 purgatory.
*/
+#include "cache.h"
#include <stdint.h>
#include <purgatory.h>
@@ -10,6 +11,8 @@
extern uint32_t *arm64_sink;
extern void (*arm64_kernel_entry)(uint64_t);
extern uint64_t arm64_dtb_addr;
+extern uint64_t arm64_ram_start;
+extern uint64_t arm64_ram_end;
static void wait_for_xmit_complete(void)
{
@@ -44,14 +47,23 @@ void putchar(int ch)
}
}
+uint64_t page_table[PAGE_TABLE_SIZE / sizeof(uint64_t)] __attribute__ ((aligned (PAGE_TABLE_SIZE))) = { };
+extern void enable_dcache(uint64_t , uint64_t , uint64_t *);
+extern void disable_dcache(uint64_t , uint64_t);
+
void setup_arch(void)
{
printf("purgatory: kernel_entry: %lx\n",
(unsigned long)arm64_kernel_entry);
printf("purgatory: dtb: %lx\n", arm64_dtb_addr);
+ printf("purgatory: RAM start: %lx\n", arm64_ram_start);
+ printf("purgatory: RAM end: %lx\n", arm64_ram_end);
+
+ enable_dcache(arm64_ram_start, arm64_ram_end, page_table);
}
void post_verification_setup_arch(void)
{
+ disable_dcache(arm64_ram_start, arm64_ram_end);
arm64_kernel_entry(arm64_dtb_addr);
}
--
2.1.0
