From 2cc6c4a0da4ab11537b2567952b59af71a90ef12 Mon Sep 17 00:00:00 2001 From: Yash Shah Date: Mon, 18 Nov 2019 05:58:34 +0000 Subject: RISC-V: Add address map dumper Add support for dumping the kernel address space layout to the console. User can enable CONFIG_DEBUG_VM to dump the virtual memory region into dmesg buffer during boot-up. Signed-off-by: Yash Shah Reviewed-by: Logan Gunthorpe Reviewed-by: Anup Patel [paul.walmsley@sifive.com: dropped .init/.text/.data/.bss prints; added PCI legacy I/O region display] Signed-off-by: Paul Walmsley --- arch/riscv/mm/init.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'arch/riscv/mm') diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 573463d1c799..c2c0e244555f 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -45,6 +45,37 @@ void setup_zero_page(void) memset((void *)empty_zero_page, 0, PAGE_SIZE); } +#ifdef CONFIG_DEBUG_VM +static inline void print_mlk(char *name, unsigned long b, unsigned long t) +{ + pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, + (((t) - (b)) >> 10)); +} + +static inline void print_mlm(char *name, unsigned long b, unsigned long t) +{ + pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, + (((t) - (b)) >> 20)); +} + +static void print_vm_layout(void) +{ + pr_notice("Virtual kernel memory layout:\n"); + print_mlk("fixmap", (unsigned long)FIXADDR_START, + (unsigned long)FIXADDR_TOP); + print_mlm("pci io", (unsigned long)PCI_IO_START, + (unsigned long)PCI_IO_END); + print_mlm("vmemmap", (unsigned long)VMEMMAP_START, + (unsigned long)VMEMMAP_END); + print_mlm("vmalloc", (unsigned long)VMALLOC_START, + (unsigned long)VMALLOC_END); + print_mlm("lowmem", (unsigned long)PAGE_OFFSET, + (unsigned long)high_memory); +} +#else +static void print_vm_layout(void) { } +#endif /* CONFIG_DEBUG_VM */ + void __init mem_init(void) { #ifdef CONFIG_FLATMEM @@ -55,6 +86,7 @@ void __init mem_init(void) memblock_free_all(); mem_init_print_info(NULL); + print_vm_layout(); } #ifdef CONFIG_BLK_DEV_INITRD -- cgit v1.2.3