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Annotation of qemu/roms/openbios/arch/ppc/timebase.S, revision 1.1.1.1

1.1       root        1: #include "asm/asmdefs.h"
                      2: #include "asm/processor.h"
                      3: 
                      4: /*
                      5:  * unsigned long long _get_ticks(void);
                      6:  */
                      7: _GLOBAL(_get_ticks):
                      8: 1:      mftbu   r3
                      9:         mftb    r4
                     10:         mftbu   r5
                     11:         cmpw    0,r3,r5
                     12:         bne     1b
                     13:         blr
                     14: 
                     15: /*
                     16:  * Delay for a number of ticks
                     17:  */
                     18: _GLOBAL(_wait_ticks):
                     19:         mflr    r8              /* save link register */
                     20:         mr      r7, r3          /* save tick count */
                     21:         bl      BRANCH_LABEL(_get_ticks)       /* Get start time */
                     22: 
                     23:         /* Calculate end time */
                     24:         addc    r7, r4, r7      /* Compute end time lower */
                     25:         addze   r6, r3          /*     and end time upper */
                     26: 
                     27: 1:      bl      BRANCH_LABEL(_get_ticks)       /* Get current time */
                     28:         subfc   r4, r4, r7      /* Subtract current time from end time */
                     29:         subfe.  r3, r3, r6
                     30:         bge     1b              /* Loop until time expired */
                     31: 
                     32:         mtlr    r8              /* restore link register */
                     33:         blr

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