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X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "wangkefeng.wang@huawei.com" , "aou@eecs.berkeley.edu" , "Anup.Patel@wdc.com" , "rppt@linux.ibm.com" , Sachin Ghadi , Yash Shah , "palmer@dabbelt.com" , "ren_guo@c-sky.com" , "tglx@linutronix.de" , "bmeng.cn@gmail.com" , "logang@deltatee.com" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org 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 --- This patch is based on Linux 5.4-rc6 and tested on SiFive HiFive Unleashed board. Changes in v2: - Avoid #ifdefs inside functions - Helper functions instead of macros - Drop newly added CONFIG_DEBUG_VM_LAYOUT, instead use CONFIG_DEBUG_VM --- arch/riscv/mm/init.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 573463d..7828136 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -45,6 +45,41 @@ 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("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); + print_mlk(".init", (unsigned long)__init_begin, + (unsigned long)__init_end); + print_mlk(".text", (unsigned long)_text, (unsigned long)_etext); + print_mlk(".data", (unsigned long)_sdata, (unsigned long)_edata); + print_mlk(".bss", (unsigned long)__bss_start, + (unsigned long)__bss_stop); +} +#else +static void print_vm_layout(void) { } +#endif /* CONFIG_DEBUG_VM */ + void __init mem_init(void) { #ifdef CONFIG_FLATMEM @@ -55,6 +90,7 @@ void __init mem_init(void) memblock_free_all(); mem_init_print_info(NULL); + print_vm_layout(); } #ifdef CONFIG_BLK_DEV_INITRD -- 2.7.4 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv