/*
* 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 MIN(a, b)       ((a) < (b)? (a): (b))
#define MAX(a, b)       ((a) > (b)? (a): (b))

/*
* Not sure where these macros should go.
* This probably isn't right but will do for now.
* The macro names are problematic too.
*/
/*
* In B(o), 'o' is the bit offset in the register.
* For multi-bit fields use F(v, o, w) where 'v' is the value
* of the bit-field of width 'w' with LSb at bit offset 'o'.
*/
#define B(o)            (1<<(o))
#define F(v, o, w)      (((v) & ((1<<(w))-1))<<(o))

#define FCLR(d, o, w)   ((d) & ~(((1<<(w))-1)<<(o)))
#define FEXT(d, o, w)   (((d)>>(o)) & ((1<<(w))-1))
#define FINS(d, o, w, v) (FCLR((d), (o), (w))|F((v), (o), (w)))
#define FSET(d, o, w)   ((d)|(((1<<(w))-1)<<(o)))

#define FMASK(o, w)     (((1<<(w))-1)<<(o))

/*
* Sizes
*/
#define BY2PG           (4*KiB)                 /* bytes per page */
#define PGSHIFT         12                      /* log(BY2PG) */
#define PGROUND(s)      ROUND(s, BY2PG)
#define ROUND(s, sz)    (((s)+(sz-1))&~(sz-1))

#define MAXMACH         1                       /* max # cpus system can run */
#define MACHSIZE        BY2PG

#define KSTACK          (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.
* u-boot claims to take 0 - 8MB.
*
* vectors are at 0, plan9.ini is at KZERO+4K and is limited to 16K by
* devenv.  L2 PTEs for trap vectors & i/o regs are stored from KZERO+56K
* to L1-MACHSIZE (KZERO+60K).  cpu0's Mach struct is at L1 - MACHSIZE(4K)
* to L1 (KZERO+60K to KZERO+64K).  L1 PTEs are stored from L1 to L1+32K
* (KZERO+64K to KZERO+96K).  KTZERO may be anywhere after KZERO+96K.
*/

#define KSEG0           0x60000000              /* kernel segment */
/* mask to check segment; good for 512MB dram */
#define KSEGM           0xE0000000
#define KZERO           KSEG0                   /* kernel address space */
#define CONFADDR        (KZERO+4*KiB)           /* unparsed plan9.ini */
#define L1              (KZERO+64*KiB)          /* tt ptes: 16KiB aligned */
#define KTZERO          (KZERO+0x800000)        /* kernel text start */

#define UZERO           0                       /* user segment */
#define UTZERO          (UZERO+BY2PG)           /* user text start */
#define USTKTOP         KZERO                   /* user segment end +1 */
#define USTKSIZE        (8*1024*1024)           /* user stack size */

/* address at which to copy and execute rebootcode */
#define REBOOTADDR      KADDR(0x100)

/*
* Time.
* Does this need to be here? Used in assembler?
*/
#define HZ              100                     /* clock frequency */
#define MS2HZ           (1000/HZ)               /* millisec per clock tick */
#define TK2SEC(t)       ((t)/HZ)                /* ticks to seconds */

/*
* More accurate time
*/
#define CLOCKFREQ       (200*1000*1000)         /* TCLK on sheeva: 200MHz */
//#define MS2TMR(t)     ((ulong)(((uvlong)(t)*CLOCKFREQ)/1000))
//#define US2TMR(t)     ((ulong)(((uvlong)(t)*CLOCKFREQ)/1000000))

/*
* Legacy...
*/
#define BLOCKALIGN      32                      /* only used in allocb.c */

/*
* 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))

/*
* These bits are completely artificial.
* With a little work these move to port.
*/
#define PTEVALID        (1<<0)
#define PTERONLY        0
#define PTEWRITE        (1<<1)
#define PTECACHED       0
#define PTEUNCACHED     (1<<2)

/*
* Physical machine information from here on.
*/
#define PHYSDRAM        0

/* from 0x80000000 up is uncached by L2 (see archkw.c) */
#define PHYSCESASRAM    0xc8010000
// #define PHYSSPIFLASH 0xe8000000              /* ignore spi flash */
/* this address is configured by u-boot, and is 0xd0000000 at reset */
#define PHYSIO          0xf1000000              /* internal registers */
#define PHYSCONS        (PHYSIO + 0x12000)      /* uart */
#define PHYSNAND1       0xf9000000              /* sheeva/openrd (remapped) */
#define PHYSNAND2       0xd8000000              /* guru */
#define PHYSBOOTROM     0xffff0000              /* boot rom */

#define FLASHSIZE       (512*MiB)               /* but not addressed linearly */

#define VIRTIO          PHYSIO

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