diff options
| -rw-r--r-- | payloads/libpayload/arch/arm64/main.c | 64 |
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(); |