diff options
Diffstat (limited to 'arch/riscv/mm')
-rw-r--r-- | arch/riscv/mm/init.c | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 658ebf645f42..30af42d78e35 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -17,6 +17,7 @@ #include <linux/initrd.h> #include <linux/swap.h> #include <linux/sizes.h> +#include <linux/of_fdt.h> #include <asm/tlbflush.h> #include <asm/sections.h> @@ -66,7 +67,76 @@ void free_initmem(void) } #ifdef CONFIG_BLK_DEV_INITRD +static void __init setup_initrd(void) +{ + unsigned long size; + + if (initrd_start >= initrd_end) { + pr_info("initrd not found or empty"); + goto disable; + } + if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { + pr_err("initrd extends beyond end of memory"); + goto disable; + } + + size = initrd_end - initrd_start; + memblock_reserve(__pa(initrd_start), size); + initrd_below_start_ok = 1; + + pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n", + (void *)(initrd_start), size); + return; +disable: + pr_cont(" - disabling initrd\n"); + initrd_start = 0; + initrd_end = 0; +} + void free_initrd_mem(unsigned long start, unsigned long end) { } #endif /* CONFIG_BLK_DEV_INITRD */ + +void __init setup_bootmem(void) +{ + struct memblock_region *reg; + phys_addr_t mem_size = 0; + + /* Find the memory region containing the kernel */ + for_each_memblock(memory, reg) { + phys_addr_t vmlinux_end = __pa(_end); + phys_addr_t end = reg->base + reg->size; + + if (reg->base <= vmlinux_end && vmlinux_end <= end) { + /* + * Reserve from the start of the region to the end of + * the kernel + */ + memblock_reserve(reg->base, vmlinux_end - reg->base); + mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET); + } + } + BUG_ON(mem_size == 0); + + set_max_mapnr(PFN_DOWN(mem_size)); + max_low_pfn = PFN_DOWN(memblock_end_of_DRAM()); + +#ifdef CONFIG_BLK_DEV_INITRD + setup_initrd(); +#endif /* CONFIG_BLK_DEV_INITRD */ + + early_init_fdt_reserve_self(); + early_init_fdt_scan_reserved_mem(); + memblock_allow_resize(); + memblock_dump_all(); + + for_each_memblock(memory, reg) { + unsigned long start_pfn = memblock_region_memory_base_pfn(reg); + unsigned long end_pfn = memblock_region_memory_end_pfn(reg); + + memblock_set_node(PFN_PHYS(start_pfn), + PFN_PHYS(end_pfn - start_pfn), + &memblock.memory, 0); + } +} |