[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Minios-devel] [PATCH v3 32/43] arm64: add the virtual address layout description
Hi, On 16/04/18 07:32, Huang Shijie wrote: This patch describes the virtual address layout for 48bit arm64: memory area (0xffff000000000000 ~ VIRT_KERNEL_AREA) : used for linear physical memory mapping kernel area (VIRT_KERNEL_AREA ~ VIRT_DEMAND_AREA) : used for map_frame_virt demand area (VIRT_DEMAND_AREA ~ VIRT_HEAP_AREA) : used for ioremap heap area (VIRT_HEAP_AREA ~ 0xffffffffffffffff) : used for heap It would be better if the documentation is added where the macro where first defined. This would improve the understanding of the values. Cheers, Signed-off-by: Huang Shijie <shijie.huang@xxxxxxx> --- include/arm/arch_mm.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/include/arm/arch_mm.h b/include/arm/arch_mm.h index 09a19c0..150259a 100644 --- a/include/arm/arch_mm.h +++ b/include/arm/arch_mm.h @@ -9,6 +9,25 @@ typedef uint64_t paddr_t; #define VIRT_DEMAND_AREA (VIRT_KERNEL_AREA + MAX_MEM_SIZE) #define VIRT_HEAP_AREA (VIRT_DEMAND_AREA + MAX_MEM_SIZE)+/*+ * The virtual address layout for arm64(48bit): + * + * -------------------------------------------------------------------------- + * | | + * -------------------------------------------------------------------------- + * ^ ^ ^ ^ ^ + * |<-- memory area -->|<-- kernel area -->|<- demand area ->|<- heap area -> | + * ^ + * ^ + * | + * (0xffff000000000000, when TCR.T0SZ == 16) + * + * memory area (0xffff000000000000 ~ VIRT_KERNEL_AREA) : used for linear physical memory mapping + * kernel area (VIRT_KERNEL_AREA ~ VIRT_DEMAND_AREA) : used for map_frame_virt + * demand area (VIRT_DEMAND_AREA ~ VIRT_HEAP_AREA) : used for ioremap + * heap area (VIRT_HEAP_AREA ~ 0xffffffffffffffff) : used for heap + */ + typedef uint64_t lpae_t;extern char _text, _etext, _erodata, _edata, _end, __bss_start; -- Julien Grall _______________________________________________ Minios-devel mailing list Minios-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/minios-devel
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