128ea44a89
a portable SG_NOEXEC segment attribute was added to allow non-executable (physical) segments. which will set the PTENOEXEC bits for putmmu(). in the future, this can be used to make non-executable stack / bss segments. the SG_DEVICE attribute was added to distinguish between mmio regions and uncached memory. only matterns on arm64. on arm, theres the issue that PTEUNCACHED would have no bits set when using the hardware bit definitions. this is the reason bcm, kw, teg2 and omap kernels use arteficial PTE constants. on zynq, the XN bit was used as a hack to give PTEUNCACHED a non-zero value and when the bit is clear then cache attributes where added to the pte. to fix this, PTECACHED constant was added. the portable mmu code in fault.c will now explicitely set PTECACHED bits for cached memory and PTEUNCACHED for uncached memory. that way the hardware bit definitions can be used everywhere.
107 lines
3 KiB
C
107 lines
3 KiB
C
/*
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* Memory and machine-specific definitions. Used in C and assembler.
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*/
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#define MIN(a, b) ((a) < (b)? (a): (b))
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#define MAX(a, b) ((a) > (b)? (a): (b))
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/*
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* Sizes
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*/
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#define BI2BY 8 /* bits per byte */
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#define BI2WD 32 /* bits per word */
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#define BY2WD 4 /* bytes per word */
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#define BY2V 8 /* bytes per double word */
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#define BY2PG 4096 /* bytes per page */
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#define WD2PG (BY2PG/BY2WD) /* words per page */
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#define PGSHIFT 12 /* log(BY2PG) */
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#define ROUND(s, sz) (((s)+((sz)-1))&~((sz)-1))
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#define PGROUND(s) ROUND(s, BY2PG)
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#define BLOCKALIGN 8
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#define FPalign 16 /* required for FXSAVE */
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#define MAXMACH 8 /* max # cpus system can run */
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#define MAX_VIRT_CPUS MAXMACH
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#define KSTACK 4096 /* Size of kernel stack */
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/*
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* Time
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*/
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#define HZ (100) /* clock frequency */
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#define MS2HZ (1000/HZ) /* millisec per clock tick */
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#define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
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/*
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* Fundamental addresses
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*/
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#define REBOOTADDR 0x00001000 /* reboot code - physical address */
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#define APBOOTSTRAP 0x80001000 /* AP bootstrap code */
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#define MACHADDR 0x80002000 /* as seen by current processor */
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#define CPU0MACH MACHADDR /* Mach for bootstrap processor */
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#define XENCONSOLE 0x80003000 /* xen console ring */
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#define XENSHARED 0x80004000 /* xen shared page */
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#define XENBUS 0x80005000 /* xenbus aka xenstore ring */
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#define XENGRANTTAB 0x80006000 /* grant table */
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#define MACHSIZE BY2PG
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/*
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* Address spaces
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*
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* User is at 0-2GB
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* Kernel is at 2GB-4GB
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*/
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#define UZERO 0 /* base of user address space */
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#define UTZERO (UZERO+BY2PG) /* first address in user text */
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#define UTROUND(t) ROUNDUP((t), BY2PG)
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#define KZERO 0x80000000 /* base of kernel address space */
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#define KTZERO 0x80010000 /* first address in kernel text */
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#define USTKTOP (KZERO-BY2PG) /* byte just beyond user stack */
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#define USTKSIZE (16*1024*1024) /* size of user stack */
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/*
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* known x86 segments (in GDT) and their selectors
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* using the selectors that xen gives us.
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*/
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#define KESEL FLAT_KERNEL_CS
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#define KDSEL FLAT_KERNEL_DS
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#define UESEL FLAT_USER_CS
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#define UDSEL FLAT_USER_DS
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#define NPROCSEG 1 /* number of per process descriptors */
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/*
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* virtual MMU
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*/
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#define PTEMAPMEM (1024*1024)
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#define PTEPERTAB (PTEMAPMEM/BY2PG)
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#define SEGMAPSIZE 1984
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#define SSEGMAPSIZE 16
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#define PPN(x) ((x)&~(BY2PG-1))
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#define PGOFF(x) ((x)&(BY2PG-1))
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/*
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* physical MMU
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*/
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#define PTEVALID (1<<0)
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#define PTEWT (1<<3)
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#define PTEUNCACHED (1<<4)
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#define PTECACHED (0<<4)
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#define PTEWRITE (1<<1)
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#define PTERONLY (0<<1)
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#define PTEKERNEL (0<<2)
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#define PTEUSER (1<<2)
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#define PTESIZE (1<<7)
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#define PTEGLOBAL (1<<8)
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/*
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* Macros for calculating offsets within the page directory base
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* and page tables.
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*/
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#define PAX(va) (paemode? ((ulong)(va)>>29) & 0x6 : 0)
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#define PDX(va) (paemode? (((ulong)(va))>>20) & 0x03FE : (((ulong)(va))>>22) & 0x03FF)
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#define PTX(va) (paemode? (((ulong)(va))>>11) & 0x03FE : (((ulong)(va))>>12) & 0x03FF)
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#define PDB(pdb,va) (paemode? KADDR(MAPPN((pdb)[((ulong)(va)>>29) & 0x6])) : pdb)
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#define getpgcolor(a) 0
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