kvisc/vm/pc/mem.h

// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

static inline ushort bswap16(ushort u)
{ return ((u<<8) | (u>>8)); }

static inline char getmempref(ushort len)
{ return (len==1?'b':(len==2?'w':(len==4?'d':(len==8?'q':'x')))); }

#define MEMOFF (1 * 1024 * 1024)
#define MEMSIZE (16 * 1024 * 1024)  // 16MB

#define MAXADDR 0x8000000000000     // 2^48 - 1

#define addr2real(p) ((p) - MEMOFF)
#define real2addr(p) ((p) + MEMOFF)

// Address of boot firmware stack
#define FWSTACK (MEMOFF * 2)        // 2MB

ulong readstr(ctx_t *ctx, ulong addr, ulong maxn, char *buf);
ulong writestr(ctx_t *ctx, ulong addr, ulong maxn, char *str);

ulong readmemzx(ctx_t *c, ulong addr, uint len);
ulong readmemsx(ctx_t *c, ulong addr, uint len);
void writemem(ctx_t *, ulong val, ulong addr, uint len);


#define SIGN_EXTEND(val, mask)                                              \
    (val & ((mask + 1) >> 1)                                                \
        ? (val | ~mask)                                                     \
        : val)