diff options
Diffstat (limited to 'arch/s390/boot/physmem_info.c')
| -rw-r--r-- | arch/s390/boot/physmem_info.c | 83 |
1 files changed, 67 insertions, 16 deletions
diff --git a/arch/s390/boot/physmem_info.c b/arch/s390/boot/physmem_info.c index 1d131a81cb8b..7617aa2d2f7e 100644 --- a/arch/s390/boot/physmem_info.c +++ b/arch/s390/boot/physmem_info.c @@ -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) @@ -109,12 +112,49 @@ static int diag260(void) return 0; } +#define DIAG500_SC_STOR_LIMIT 4 + +static int diag500_storage_limit(unsigned long *max_physmem_end) +{ + unsigned long storage_limit; + unsigned long reg1, reg2; + psw_t old; + + asm volatile( + " mvc 0(16,%[psw_old]),0(%[psw_pgm])\n" + " epsw %[reg1],%[reg2]\n" + " st %[reg1],0(%[psw_pgm])\n" + " st %[reg2],4(%[psw_pgm])\n" + " larl %[reg1],1f\n" + " stg %[reg1],8(%[psw_pgm])\n" + " lghi 1,%[subcode]\n" + " lghi 2,0\n" + " diag 2,4,0x500\n" + "1: mvc 0(16,%[psw_pgm]),0(%[psw_old])\n" + " lgr %[slimit],2\n" + : [reg1] "=&d" (reg1), + [reg2] "=&a" (reg2), + [slimit] "=d" (storage_limit), + "=Q" (get_lowcore()->program_new_psw), + "=Q" (old) + : [psw_old] "a" (&old), + [psw_pgm] "a" (&get_lowcore()->program_new_psw), + [subcode] "i" (DIAG500_SC_STOR_LIMIT) + : "memory", "1", "2"); + if (!storage_limit) + return -EINVAL; + /* Convert inclusive end to exclusive end */ + *max_physmem_end = storage_limit + 1; + return 0; +} + 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" @@ -123,19 +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) @@ -157,7 +199,9 @@ unsigned long detect_max_physmem_end(void) { unsigned long max_physmem_end = 0; - if (!sclp_early_get_memsize(&max_physmem_end)) { + if (!diag500_storage_limit(&max_physmem_end)) { + physmem_info.info_source = MEM_DETECT_DIAG500_STOR_LIMIT; + } else if (!sclp_early_get_memsize(&max_physmem_end)) { physmem_info.info_source = MEM_DETECT_SCLP_READ_INFO; } else { max_physmem_end = search_mem_end(); @@ -170,6 +214,13 @@ void detect_physmem_online_ranges(unsigned long max_physmem_end) { if (!sclp_early_read_storage_info()) { physmem_info.info_source = MEM_DETECT_SCLP_STOR_INFO; + } else if (physmem_info.info_source == MEM_DETECT_DIAG500_STOR_LIMIT) { + unsigned long online_end; + + if (!sclp_early_get_memsize(&online_end)) { + physmem_info.info_source = MEM_DETECT_SCLP_READ_INFO; + add_physmem_online_range(0, online_end); + } } else if (!diag260()) { physmem_info.info_source = MEM_DETECT_DIAG260; } else if (max_physmem_end) { |