49eb1f4806
Primary purpose of change: to support the mmap implementation, VM must know both (a) about some block metadata for FS cache blocks, i.e. inode numbers and inode offsets where applicable; and (b) know about *all* cache blocks, i.e. also of the FS primary caches and not just the blocks that spill into the secondary one. This changes the interface and VM data structures. This change is only for the interface (libminixfs) and VM data structures; the filesystem code is unmodified, so although the secondary cache will be used as normal, blocks will not be annotated with inode information until the FS is modified to provide this information. Until it is modified, mmap of files will fail gracefully on such filesystems. This is indicated to VFS/VM by returning ENOSYS for REQ_PEEK. Change-Id: I1d2df6c485e6c5e89eb28d9055076cc02629594e
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
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#ifndef _VM_H
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#define _VM_H 1
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#define _SYSTEM 1
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/* Compile in asserts and custom sanity checks at all? */
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#define SANITYCHECKS 0
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#define CACHE_SANITY 0
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#define VMSTATS 0
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/* VM behaviour */
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#define MEMPROTECT 0 /* Slab objects not mapped. Access with USE() */
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#define JUNKFREE 0 /* Fill freed pages with junk */
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#include <sys/errno.h>
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#include "sanitycheck.h"
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#include "region.h"
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/* Memory flags to pt_allocmap() and alloc_mem(). */
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#define PAF_CLEAR 0x01 /* Clear physical memory. */
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#define PAF_CONTIG 0x02 /* Physically contiguous. */
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#define PAF_ALIGN64K 0x04 /* Aligned to 64k boundary. */
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#define PAF_LOWER16MB 0x08
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#define PAF_LOWER1MB 0x10
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#define PAF_ALIGN16K 0x40 /* Aligned to 16k boundary. */
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#define MARK do { if(mark) { printf("%d\n", __LINE__); } } while(0)
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/* special value for v in pt_allocmap */
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#define AM_AUTO ((u32_t) -1)
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/* How noisy are we supposed to be? */
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#define VERBOSE 0
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#define LU_DEBUG 0
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/* Minimum stack region size - 64MB. */
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#define MINSTACKREGION (64*1024*1024)
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/* If so, this level: */
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#define SCL_NONE 0 /* No sanity checks - assert()s only. */
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#define SCL_TOP 1 /* Main loop and other high-level places. */
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#define SCL_FUNCTIONS 2 /* Function entry/exit. */
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#define SCL_DETAIL 3 /* Detailled steps. */
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#define SCL_MAX 3 /* Highest value. */
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/* Type of page allocations. */
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#define VMP_SPARE 0
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#define VMP_PAGETABLE 1
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#define VMP_PAGEDIR 2
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#define VMP_SLAB 3
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#define VMP_CATEGORIES 4
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/* Flags to pt_writemap(). */
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#define WMF_OVERWRITE 0x01 /* Caller knows map may overwrite. */
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#define WMF_WRITEFLAGSONLY 0x02 /* Copy physaddr and update flags. */
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#define WMF_FREE 0x04 /* Free pages overwritten. */
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#define WMF_VERIFY 0x08 /* Check pagetable contents. */
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#define MAP_NONE 0xFFFFFFFE
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#define NO_MEM ((phys_clicks) MAP_NONE) /* returned by alloc_mem() with mem is up */
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/* And what is the highest addressable piece of memory? */
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#define VM_DATATOP kernel_boot_info.user_end
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#define VM_STACKTOP kernel_boot_info.user_sp
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#endif
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