1992/0116/ss/bbmalloc.c (diff list | history)

1991/0723/sys/src/9/ss/bbmalloc.c:7,27 – 1992/0116/sys/src/9/ss/bbmalloc.c:7,12 (short | long | prev | next)
1991/0723		/* * Allocate memory for use in kernel bitblts. * The allocated memory must have a flushed instruction * cache, and the data cache must be flushed by bbdflush(). * To avoid the need for frequent cache flushes, the memory * is allocated out of an arena, and the i-cache is only * flushed when it has to be reused. By returning an * address in non-cached space, the need for flushing the * d-cache is avoided. * * Currently, the only kernel users of bitblt are devbit, * print, and the cursor stuff in devbit. The cursor * can get drawn at clock interrupt time, so it might need * to bbmalloc while another bitblt is going on. * * This code will have to be interlocked if we ever get * a multiprocessor with a bitmapped display. */ /* a 0->3 bitblt can take 900 words */
1991/0723/sys/src/9/ss/bbmalloc.c:48,57 – 1992/0116/sys/src/9/ss/bbmalloc.c:33,38
1991/0723		ans = bbcur; bbcur = ans + nw; splx(s); /* if(ans == bbarena) icflush(ans, sizeof(bbarena)); */ bblast = ans; ans = (void *)ans; return ans;
1991/0723/sys/src/9/ss/bbmalloc.c:66,73 – 1992/0116/sys/src/9/ss/bbmalloc.c:47,56
1991/0723		bbcur = (ulong *)(((char *)bblast) + n); } void * bbdflush(void *p, int n)
1992/0116		int bbonstack(void)
1991/0723		{ return p;
1992/0116		if(u) return 1; return 0;
1991/0723		}