ref: 60befe7df166ae7464c665394ba3793d9d26e184
dir: /sys/src/9/bcm/mem.h/
/* * 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 */ /* 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)