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Blackfin arch: Zero out bss region in L1/L2 memory. 

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Graf Yang 2008-10-16 22:50:46 +08:00 committed by Bryan Wu
parent 121e598f5d
commit b4f5c58fd1
1 changed files with 54 additions and 0 deletions
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54
arch/blackfin/mach-common/head.S
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@ -206,6 +206,60 @@ ENTRY(_real_start)
w[p0] = r0;
ssync;
#if L1_DATA_A_LENGTH > 0
r1.l = __sbss_l1;
r1.h = __sbss_l1;
r2.l = __ebss_l1;
r2.h = __ebss_l1;
r0 = 0 (z);
r2 = r2 - r1;
cc = r2 == 0;
if cc jump .L_a_l1_done;
r2 >>= 2;
p1 = r1;
p2 = r2;
lsetup (.L_clear_a_l1, .L_clear_a_l1 ) lc0 = p2;
.L_clear_a_l1:
[p1++] = r0;
.L_a_l1_done:
#endif
#if L1_DATA_B_LENGTH > 0
r1.l = __sbss_b_l1;
r1.h = __sbss_b_l1;
r2.l = __ebss_b_l1;
r2.h = __ebss_b_l1;
r0 = 0 (z);
r2 = r2 - r1;
cc = r2 == 0;
if cc jump .L_b_l1_done;
r2 >>= 2;
p1 = r1;
p2 = r2;
lsetup (.L_clear_b_l1, .L_clear_b_l1 ) lc0 = p2;
.L_clear_b_l1:
[p1++] = r0;
.L_b_l1_done:
#endif
#if L2_LENGTH > 0
r1.l = __sbss_l2;
r1.h = __sbss_l2;
r2.l = __ebss_l2;
r2.h = __ebss_l2;
r0 = 0 (z);
r2 = r2 - r1;
cc = r2 == 0;
if cc jump .L_l2_done;
r2 >>= 2;
p1 = r1;
p2 = r2;
lsetup (.L_clear_l2, .L_clear_l2 ) lc0 = p2;
.L_clear_l2:
[p1++] = r0;
.L_l2_done:
#endif
/* Zero out the bss region
* Note: this will fail if bss is 0 bytes ...
*/