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/*
* Memory and machine-specific definitions. Used in C and assembler.
*/
#define KiB 1024u /* Kibi 0x0000000000000400 */
#define MiB 1048576u /* Mebi 0x0000000000100000 */
#define GiB 1073741824u /* Gibi 000000000040000000 */
#define HOWMANY(x, y) (((x)+((y)-1))/(y))
#define ROUNDUP(x, y) (HOWMANY((x), (y))*(y)) /* ceiling */
#define ROUNDDN(x, y) (((x)/(y))*(y)) /* floor */
#define MIN(a, b) ((a) < (b)? (a): (b))
#define MAX(a, b) ((a) > (b)? (a): (b))
/*
* Sizes
*/
#define BY2PG (4*KiB) /* bytes per page */
#define PGSHIFT 12 /* log(BY2PG) */
#define PGROUND(s) ROUNDUP(s, BY2PG)
#define ROUND(s, sz) (((s)+(sz-1))&~(sz-1))
#define MAXMACH 1 /* max # cpus system can run */
#define MACHSIZE BY2PG
#define KSTKSIZE (8*KiB)
#define STACKALIGN(sp) ((sp) & ~3) /* bug: assure with alloc */
/*
* Address spaces.
* KTZERO is used by kprof and dumpstack (if any).
*
* KZERO is mapped to physical 0 (start of ram).
*
* vectors are at 0, plan9.ini is at KZERO+256 and is limited to 16K by
* devenv.
*/
#define KSEG0 0x80000000 /* kernel segment */
/* mask to check segment; good for 512MB dram */
#define KSEGM 0xE0000000
#define KZERO KSEG0 /* kernel address space */
#define CONFADDR (KZERO+0x100) /* unparsed plan9.ini */
#define MACHADDR (KZERO+0x2000) /* Mach structure */
#define L2 (KZERO+0x3000) /* L2 ptes for vectors etc */
#define VCBUFFER (KZERO+0x3400) /* videocore mailbox buffer */
#define FIQSTKTOP (KZERO+0x4000) /* FIQ stack */
#define L1 (KZERO+0x4000) /* tt ptes: 16KiB aligned */
#define KTZERO (KZERO+0x8000) /* kernel text start */
#define VIRTIO 0x7E000000 /* i/o registers */
#define FRAMEBUFFER 0xA0000000 /* video framebuffer */
#define UZERO 0 /* user segment */
#define UTZERO (UZERO+BY2PG) /* user text start */
#define USTKTOP 0x20000000 /* user segment end +1 */
#define USTKSIZE (8*1024*1024) /* user stack size */
#define TSTKTOP (USTKTOP-USTKSIZE) /* sysexec temporary stack */
#define TSTKSIZ 256
/* address at which to copy and execute rebootcode */
#define REBOOTADDR (KZERO+0x3400)
/*
* Legacy...
*/
#define BLOCKALIGN 32 /* only used in allocb.c */
#define KSTACK KSTKSIZE
/*
* Sizes
*/
#define BI2BY 8 /* bits per byte */
#define BY2SE 4
#define BY2WD 4
#define BY2V 8 /* only used in xalloc.c */
#define CACHELINESZ 32
#define PTEMAPMEM (1024*1024)
#define PTEPERTAB (PTEMAPMEM/BY2PG)
#define SEGMAPSIZE 1984
#define SSEGMAPSIZE 16
#define PPN(x) ((x)&~(BY2PG-1))
/*
* With a little work these move to port.
*/
#define PTEVALID (1<<0)
#define PTERONLY 0
#define PTEWRITE (1<<1)
#define PTEUNCACHED (1<<2)
#define PTEKERNEL (1<<3)
/*
* Physical machine information from here on.
* PHYS addresses as seen from the arm cpu.
* BUS addresses as seen from the videocore gpu.
*/
#define PHYSDRAM 0
#define BUSDRAM 0x40000000
#define DRAMSIZE (512*MiB)
#define PHYSIO 0x20000000
#define BUSIO 0x7E000000
#define IOSIZE (16*MiB)
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