[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v6 05/14] arm/mem_access: Add short-descriptor pte typedefs and macros
The current implementation does not provide appropriate types for short-descriptor translation table entries. As such, this commit adds new types, which simplify managing the respective translation table entries. Signed-off-by: Sergej Proskurin <proskurin@xxxxxxxxxxxxx> Acked-by: Julien Grall <julien.grall@xxxxxxx> --- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx> Cc: Julien Grall <julien.grall@xxxxxxx> --- v3: Add more short-descriptor related pte typedefs that will be used by the following commits. v4: Move short-descriptor pte typedefs out of page.h into short-desc.h. Change the type unsigned int to bool of every bitfield in short-descriptor related data-structures that holds only one bit. Change the typedef names from pte_sd_* to short_desc_*. v5: Add {L1|L2}DESC_* defines to this commit. v6: Add Julien Grall's Acked-by. --- xen/include/asm-arm/short-desc.h | 130 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 130 insertions(+) create mode 100644 xen/include/asm-arm/short-desc.h diff --git a/xen/include/asm-arm/short-desc.h b/xen/include/asm-arm/short-desc.h new file mode 100644 index 0000000000..9652a103c4 --- /dev/null +++ b/xen/include/asm-arm/short-desc.h @@ -0,0 +1,130 @@ +#ifndef __ARM_SHORT_DESC_H__ +#define __ARM_SHORT_DESC_H__ + +/* + * First level translation table descriptor types used by the AArch32 + * short-descriptor translation table format. + */ +#define L1DESC_INVALID (0) +#define L1DESC_PAGE_TABLE (1) +#define L1DESC_SECTION (2) +#define L1DESC_SECTION_PXN (3) + +/* Defines for section and supersection shifts. */ +#define L1DESC_SECTION_SHIFT (20) +#define L1DESC_SUPERSECTION_SHIFT (24) +#define L1DESC_SUPERSECTION_EXT_BASE1_SHIFT (32) +#define L1DESC_SUPERSECTION_EXT_BASE2_SHIFT (36) + +/* Second level translation table descriptor types. */ +#define L2DESC_INVALID (0) + +/* Defines for small (4K) and large page (64K) shifts. */ +#define L2DESC_SMALL_PAGE_SHIFT (12) +#define L2DESC_LARGE_PAGE_SHIFT (16) + +/* + * Comprises bits of the level 1 short-descriptor format representing + * a section. + */ +typedef struct __packed { + bool pxn:1; /* Privileged Execute Never */ + bool sec:1; /* == 1 if section or supersection */ + bool b:1; /* Bufferable */ + bool c:1; /* Cacheable */ + bool xn:1; /* Execute Never */ + unsigned int dom:4; /* Domain field */ + bool impl:1; /* Implementation defined */ + unsigned int ap:2; /* AP[1:0] */ + unsigned int tex:3; /* TEX[2:0] */ + bool ro:1; /* AP[2] */ + bool s:1; /* Shareable */ + bool ng:1; /* Non-global */ + bool supersec:1; /* Must be 0 for sections */ + bool ns:1; /* Non-secure */ + unsigned int base:12; /* Section base address */ +} short_desc_l1_sec_t; + +/* + * Comprises bits of the level 1 short-descriptor format representing + * a supersection. + */ +typedef struct __packed { + bool pxn:1; /* Privileged Execute Never */ + bool sec:1; /* == 1 if section or supersection */ + bool b:1; /* Bufferable */ + bool c:1; /* Cacheable */ + bool xn:1; /* Execute Never */ + unsigned int extbase2:4; /* Extended base address, PA[39:36] */ + bool impl:1; /* Implementation defined */ + unsigned int ap:2; /* AP[1:0] */ + unsigned int tex:3; /* TEX[2:0] */ + bool ro:1; /* AP[2] */ + bool s:1; /* Shareable */ + bool ng:1; /* Non-global */ + bool supersec:1; /* Must be 0 for sections */ + bool ns:1; /* Non-secure */ + unsigned int extbase1:4; /* Extended base address, PA[35:32] */ + unsigned int base:8; /* Supersection base address */ +} short_desc_l1_supersec_t; + +/* + * Comprises bits of the level 2 short-descriptor format representing + * a small page. + */ +typedef struct __packed { + bool xn:1; /* Execute Never */ + bool page:1; /* ==1 if small page */ + bool b:1; /* Bufferable */ + bool c:1; /* Cacheable */ + unsigned int ap:2; /* AP[1:0] */ + unsigned int tex:3; /* TEX[2:0] */ + bool ro:1; /* AP[2] */ + bool s:1; /* Shareable */ + bool ng:1; /* Non-global */ + unsigned int base:20; /* Small page base address */ +} short_desc_l2_page_t; + +/* + * Comprises bits of the level 2 short-descriptor format representing + * a large page. + */ +typedef struct __packed { + bool lpage:1; /* ==1 if large page */ + bool page:1; /* ==0 if large page */ + bool b:1; /* Bufferable */ + bool c:1; /* Cacheable */ + unsigned int ap:2; /* AP[1:0] */ + unsigned int sbz:3; /* Should be zero */ + bool ro:1; /* AP[2] */ + bool s:1; /* Shareable */ + bool ng:1; /* Non-global */ + unsigned int tex:3; /* TEX[2:0] */ + bool xn:1; /* Execute Never */ + unsigned int base:16; /* Large page base address */ +} short_desc_l2_lpage_t; + +/* + * Comprises the bits required to walk page tables adhering to the + * short-descriptor translation table format. + */ +typedef struct __packed { + unsigned int dt:2; /* Descriptor type */ + unsigned int pad1:8; + unsigned int base:22; /* Base address of block or next table */ +} short_desc_walk_t; + +/* + * Represents page table entries adhering to the short-descriptor translation + * table format. + */ +typedef union { + uint32_t bits; + short_desc_walk_t walk; + short_desc_l1_sec_t sec; + short_desc_l1_supersec_t supersec; + short_desc_l2_page_t pg; + short_desc_l2_lpage_t lpg; +} short_desc_t; + +#endif /* __ARM_SHORT_DESC_H__ */ -- 2.13.2 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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