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arch/tile: support building big-endian kernel

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The toolchain supports big-endian mode now, so add support for building
the kernel to run big-endian as well.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
This commit is contained in:
Chris Metcalf
2012-03-29 13:30:31 -04:00
parent 73636b1aac
commit 1efea40d41
10 changed files with 130 additions and 29 deletions
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15
arch/tile/lib/strchr_64.c
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@@ -15,8 +15,7 @@
#include <linux/types.h>
#include <linux/string.h>
#include <linux/module.h>
#undef strchr
#include "string-endian.h"
char *strchr(const char *s, int c)
{
@@ -33,13 +32,9 @@ char *strchr(const char *s, int c)
* match neither zero nor goal (we make sure the high bit of each
* byte is 1, and the low 7 bits are all the opposite of the goal
* byte).
*
* Note that this shift count expression works because we know shift
* counts are taken mod 64.
*/
const uint64_t before_mask = (1ULL << (s_int << 3)) - 1;
uint64_t v = (*p | before_mask) ^
(goal & __insn_v1shrsi(before_mask, 1));
const uint64_t before_mask = MASK(s_int);
uint64_t v = (*p | before_mask) ^ (goal & __insn_v1shrui(before_mask, 1));
uint64_t zero_matches, goal_matches;
while (1) {
@@ -55,8 +50,8 @@ char *strchr(const char *s, int c)
v = *++p;
}
z = __insn_ctz(zero_matches);
g = __insn_ctz(goal_matches);
z = CFZ(zero_matches);
g = CFZ(goal_matches);
/* If we found c before '\0' we got a match. Note that if c == '\0'
* then g == z, and we correctly return the address of the '\0'