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#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__ */
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