From 2939844d0211a820cf22a8d666df90af889ec6f1 Mon Sep 17 00:00:00 2001 Message-Id: <2939844d0211a820cf22a8d666df90af889ec6f1.1430751022.git.panand@redhat.com> In-Reply-To: <8b40614f4c1925fe94f274dfc69d1a63537fe399.1430751022.git.panand@redhat.com> References: <8b40614f4c1925fe94f274dfc69d1a63537fe399.1430751022.git.panand@redhat.com> From: Pratyush Anand Date: Mon, 4 May 2015 17:50:21 +0530 Subject: [PATCH 3/3] arm64: Enable/disable D-cache before/after sha verification 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 --- 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 #include @@ -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