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-rw-r--r--payloads/libpayload/arch/arm64/main.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/payloads/libpayload/arch/arm64/main.c b/payloads/libpayload/arch/arm64/main.c
index 6b45a018c2..4561e2e08d 100644
--- a/payloads/libpayload/arch/arm64/main.c
+++ b/payloads/libpayload/arch/arm64/main.c
@@ -29,6 +29,7 @@
#include <exception.h>
#include <libpayload.h>
+#include <arch/mmu.h>
unsigned int main_argc; /**< The argc value to pass to main() */
@@ -48,6 +49,64 @@ static int test_exception(void)
return 0;
}
+/*
+ * Func: pre_sysinfo_scan_mmu_setup
+ * Desc: We need to setup and enable MMU before we can go to scan coreboot
+ * tables. However, we are not sure what all memory regions to map. Thus,
+ * initializing minimum required memory ranges
+ */
+static void pre_sysinfo_scan_mmu_setup(void)
+{
+ uint64_t start = (uint64_t)&_start;
+ uint64_t end = (uint64_t)&_end;
+
+ /* Memory range 1: Covers the area occupied by payload */
+ mmu_presysinfo_memory_used(start, end - start);
+
+ /*
+ * Memory range 2: Coreboot tables
+ *
+ * Maximum size is assumed 2 pages in case it crosses the GRANULE_SIZE
+ * boundary
+ */
+ mmu_presysinfo_memory_used((uint64_t)get_cb_header_ptr(),
+ 2 * GRANULE_SIZE);
+
+ mmu_presysinfo_enable();
+}
+
+/*
+ * Func: post_sysinfo_scan_mmu_setup
+ * Desc: Once we have scanned coreboot tables, we have complete information
+ * about different memory ranges. Thus, we can perform a complete mmu
+ * initialization. Also, this takes care of DMA area setup
+ */
+static void post_sysinfo_scan_mmu_setup(void)
+{
+ struct memrange *ranges;
+ uint64_t nranges;
+ struct mmu_ranges mmu_ranges;
+ struct mmu_memrange *dma_range;
+
+ /* Get memrange info from lib_sysinfo */
+ lib_sysinfo_get_memranges(&ranges, &nranges);
+
+ /* Get memory ranges for mmu init from lib_sysinfo memrange */
+ dma_range = mmu_init_ranges_from_sysinfo(ranges, nranges, &mmu_ranges);
+
+ /* Disable mmu */
+ mmu_disable();
+
+ /* Init mmu */
+ mmu_init(&mmu_ranges);
+
+ /* Enable mmu */
+ mmu_enable();
+
+ /* Init dma memory */
+ init_dma_memory((void *)dma_range->base, dma_range->size);
+}
+
/**
* This is our C entry function - set up the system
* and jump into the payload entry point.
@@ -57,12 +116,17 @@ void start_main(void)
{
extern int main(int argc, char **argv);
+ pre_sysinfo_scan_mmu_setup();
+
/* Gather system information. */
lib_get_sysinfo();
#ifndef CONFIG_LP_SKIP_CONSOLE_INIT
console_init();
#endif
+
+ post_sysinfo_scan_mmu_setup();
+
printf("ARM64: Libpayload %s\n",__func__);
exception_init();