diff options
Diffstat (limited to 'usr/src/uts/common/vm/page.h')
| -rw-r--r-- | usr/src/uts/common/vm/page.h | 38 |
1 files changed, 27 insertions, 11 deletions
diff --git a/usr/src/uts/common/vm/page.h b/usr/src/uts/common/vm/page.h index 28ba33cedf..db0129195d 100644 --- a/usr/src/uts/common/vm/page.h +++ b/usr/src/uts/common/vm/page.h @@ -39,8 +39,6 @@ #ifndef _VM_PAGE_H #define _VM_PAGE_H -#pragma ident "%Z%%M% %I% %E% SMI" - #include <vm/seg.h> #ifdef __cplusplus @@ -1033,18 +1031,36 @@ typedef struct kpm_hlk { * to save memory space. Alias range mappings and regular segkpm * mappings are done in units of PAGESIZE and can share the mapping * information and the mappings are always distinguishable by their - * virtual address. Other information neeeded for VAC conflict prevention - * is already available on a per page basis. There are basically 3 states - * a kpm_spage can have: not mapped (0), mapped in Alias range or virtually - * uncached (1) and mapped in the regular segkpm window (-1). The -1 value - * is also used as "go" indication for the segkpm trap level tsbmiss - * handler for small pages (value is kept the same as it is used for large - * mappings). + * virtual address. Other information needed for VAC conflict prevention + * is already available on a per page basis. + * + * The state about how a kpm page is mapped and whether it is ready to go + * is indicated by the following 1 byte kpm_spage structure. This byte is + * split into two 4-bit parts - kp_mapped and kp_mapped_go. + * - kp_mapped == 1 the page is mapped cacheable + * - kp_mapped == 2 the page is mapped non-cacheable + * - kp_mapped_go == 1 the mapping is ready to be dropped in + * - kp_mapped_go == 0 the mapping is not ready to be dropped in. + * When kp_mapped_go == 0, we will have C handler resolve the VAC conflict. + * Otherwise, the assembly tsb miss handler can simply drop in the mapping + * when a tsb miss occurs. */ -typedef struct kpm_spage { - char kp_mapped; /* page mapped small */ +typedef union kpm_spage { + struct { +#ifdef _BIG_ENDIAN + uchar_t mapped_go: 4; /* go or nogo flag */ + uchar_t mapped: 4; /* page mapped small */ +#else + uchar_t mapped: 4; /* page mapped small */ + uchar_t mapped_go: 4; /* go or nogo flag */ +#endif + } kpm_spage_un; + uchar_t kp_mapped_flag; } kpm_spage_t; +#define kp_mapped kpm_spage_un.mapped +#define kp_mapped_go kpm_spage_un.mapped_go + /* * Note: kshl_lock offset changes must be reflected in sfmmu_asm.s */ |