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s390/boot/physmem: Convert to use flag output macros

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Use flag output macros in inline asm to allow for better code generation if
the compiler has support for the flag output constraint.

Reviewed-by: Juergen Christ <jchrist@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2024-11-07 16:11:49 +01:00
parent 0eb597bd81
commit d80888232e
1 changed files with 21 additions and 15 deletions
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36
arch/s390/boot/physmem_info.c
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@ -9,6 +9,7 @@
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sclp.h>
#include <asm/asm.h>
#include <asm/uv.h>
#include "decompressor.h"
#include "boot.h"
@ -59,13 +60,13 @@ static int __diag260(unsigned long rx1, unsigned long rx2)
{
unsigned long reg1, reg2, ry;
union register_pair rx;
int cc, exception;
psw_t old;
int rc;
rx.even = rx1;
rx.odd = rx2;
ry = 0x10; /* storage configuration */
rc = -1; /* fail */
exception = 1;
asm volatile(
" mvc 0(16,%[psw_old]),0(%[psw_pgm])\n"
" epsw %[reg1],%[reg2]\n"
@ -74,20 +75,22 @@ static int __diag260(unsigned long rx1, unsigned long rx2)
" larl %[reg1],1f\n"
" stg %[reg1],8(%[psw_pgm])\n"
" diag %[rx],%[ry],0x260\n"
" ipm %[rc]\n"
" srl %[rc],28\n"
" lhi %[exc],0\n"
"1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n"
: [reg1] "=&d" (reg1),
CC_IPM(cc)
: CC_OUT(cc, cc),
[exc] "+d" (exception),
[reg1] "=&d" (reg1),
[reg2] "=&a" (reg2),
[rc] "+&d" (rc),
[ry] "+&d" (ry),
"+Q" (get_lowcore()->program_new_psw),
"=Q" (old)
: [rx] "d" (rx.pair),
[psw_old] "a" (&old),
[psw_pgm] "a" (&get_lowcore()->program_new_psw)
: "cc", "memory");
return rc == 0 ? ry : -1;
: CC_CLOBBER_LIST("memory"));
cc = exception ? -1 : CC_TRANSFORM(cc);
return cc == 0 ? ry : -1;
}
static int diag260(void)
@ -148,9 +151,10 @@ static int diag500_storage_limit(unsigned long *max_physmem_end)
static int tprot(unsigned long addr)
{
unsigned long reg1, reg2;
int rc = -EFAULT;
int cc, exception;
psw_t old;
exception = 1;
asm volatile(
" mvc 0(16,%[psw_old]),0(%[psw_pgm])\n"
" epsw %[reg1],%[reg2]\n"
@ -159,19 +163,21 @@ static int tprot(unsigned long addr)
" larl %[reg1],1f\n"
" stg %[reg1],8(%[psw_pgm])\n"
" tprot 0(%[addr]),0\n"
" ipm %[rc]\n"
" srl %[rc],28\n"
" lhi %[exc],0\n"
"1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n"
: [reg1] "=&d" (reg1),
CC_IPM(cc)
: CC_OUT(cc, cc),
[exc] "+d" (exception),
[reg1] "=&d" (reg1),
[reg2] "=&a" (reg2),
[rc] "+&d" (rc),
"=Q" (get_lowcore()->program_new_psw.addr),
"=Q" (old)
: [psw_old] "a" (&old),
[psw_pgm] "a" (&get_lowcore()->program_new_psw),
[addr] "a" (addr)
: "cc", "memory");
return rc;
: CC_CLOBBER_LIST("memory"));
cc = exception ? -EFAULT : CC_TRANSFORM(cc);
return cc;
}
static unsigned long search_mem_end(void)