/*
* arch/s390/kernel/smp.c
*
- * Copyright IBM Corp. 1999,2007
+ * Copyright IBM Corp. 1999, 2009
* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
* Martin Schwidefsky (schwidefsky@de.ibm.com)
* Heiko Carstens (heiko.carstens@de.ibm.com)
static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show,
dispatching_store);
+/*
+ * If the resume kernel runs on another cpu than the suspended kernel,
+ * we have to switch the cpu IDs in the logical map.
+ */
+void smp_switch_boot_cpu_in_resume(u32 resume_phys_cpu_id,
+ struct _lowcore *suspend_lowcore)
+{
+ int cpu, suspend_cpu_id, resume_cpu_id;
+ u32 suspend_phys_cpu_id;
+
+ suspend_phys_cpu_id = __cpu_logical_map[suspend_lowcore->cpu_nr];
+ suspend_cpu_id = suspend_lowcore->cpu_nr;
+
+ for_each_present_cpu(cpu) {
+ if (__cpu_logical_map[cpu] == resume_phys_cpu_id) {
+ resume_cpu_id = cpu;
+ goto found;
+ }
+ }
+ panic("Could not find resume cpu in logical map.\n");
+
+found:
+ printk("Resume cpu ID: %i/%i\n", resume_phys_cpu_id, resume_cpu_id);
+ printk("Suspend cpu ID: %i/%i\n", suspend_phys_cpu_id, suspend_cpu_id);
+
+ __cpu_logical_map[resume_cpu_id] = suspend_phys_cpu_id;
+ __cpu_logical_map[suspend_cpu_id] = resume_phys_cpu_id;
+
+ lowcore_ptr[suspend_cpu_id]->cpu_addr = resume_phys_cpu_id;
+}
+
+u32 smp_get_phys_cpu_id(void)
+{
+ return __cpu_logical_map[smp_processor_id()];
+}
+
static int __init topology_init(void)
{
int cpu;
--- /dev/null
+/*
+ * S390 64-bit swsusp implementation
+ *
+ * Copyright IBM Corp. 2009
+ *
+ * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com>
+ * Michael Holzheu <holzheu@linux.vnet.ibm.com>
+ */
+
+#include <asm/page.h>
+#include <asm/ptrace.h>
+#include <asm/asm-offsets.h>
+
+/*
+ * Save register context in absolute 0 lowcore and call swsusp_save() to
+ * create in-memory kernel image. The context is saved in the designated
+ * "store status" memory locations (see POP).
+ * We return from this function twice. The first time during the suspend to
+ * disk process. The second time via the swsusp_arch_resume() function
+ * (see below) in the resume process.
+ * This function runs with disabled interrupts.
+ */
+ .section .text
+ .align 2
+ .globl swsusp_arch_suspend
+swsusp_arch_suspend:
+ stmg %r6,%r15,__SF_GPRS(%r15)
+ lgr %r1,%r15
+ aghi %r15,-STACK_FRAME_OVERHEAD
+ stg %r1,__SF_BACKCHAIN(%r15)
+
+ /* Deactivate DAT */
+ stnsm __SF_EMPTY(%r15),0xfb
+
+ /* Switch off lowcore protection */
+ stctg %c0,%c0,__SF_EMPTY(%r15)
+ ni __SF_EMPTY+4(%r15),0xef
+ lctlg %c0,%c0,__SF_EMPTY(%r15)
+
+ /* Store prefix register on stack */
+ stpx __SF_EMPTY(%r15)
+
+ /* Setup base register for lowcore (absolute 0) */
+ llgf %r1,__SF_EMPTY(%r15)
+
+ /* Get pointer to save area */
+ aghi %r1,0x1000
+
+ /* Store registers */
+ mvc 0x318(4,%r1),__SF_EMPTY(%r15) /* move prefix to lowcore */
+ stfpc 0x31c(%r1) /* store fpu control */
+ std 0,0x200(%r1) /* store f0 */
+ std 1,0x208(%r1) /* store f1 */
+ std 2,0x210(%r1) /* store f2 */
+ std 3,0x218(%r1) /* store f3 */
+ std 4,0x220(%r1) /* store f4 */
+ std 5,0x228(%r1) /* store f5 */
+ std 6,0x230(%r1) /* store f6 */
+ std 7,0x238(%r1) /* store f7 */
+ std 8,0x240(%r1) /* store f8 */
+ std 9,0x248(%r1) /* store f9 */
+ std 10,0x250(%r1) /* store f10 */
+ std 11,0x258(%r1) /* store f11 */
+ std 12,0x260(%r1) /* store f12 */
+ std 13,0x268(%r1) /* store f13 */
+ std 14,0x270(%r1) /* store f14 */
+ std 15,0x278(%r1) /* store f15 */
+ stam %a0,%a15,0x340(%r1) /* store access registers */
+ stctg %c0,%c15,0x380(%r1) /* store control registers */
+ stmg %r0,%r15,0x280(%r1) /* store general registers */
+
+ stpt 0x328(%r1) /* store timer */
+ stckc 0x330(%r1) /* store clock comparator */
+
+ /* Activate DAT */
+ stosm __SF_EMPTY(%r15),0x04
+
+ /* Set prefix page to zero */
+ xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15)
+ spx __SF_EMPTY(%r15)
+
+ /* Setup lowcore */
+ brasl %r14,setup_lowcore_early
+
+ /* Save image */
+ brasl %r14,swsusp_save
+
+ /* Switch on lowcore protection */
+ stctg %c0,%c0,__SF_EMPTY(%r15)
+ oi __SF_EMPTY+4(%r15),0x10
+ lctlg %c0,%c0,__SF_EMPTY(%r15)
+
+ /* Restore prefix register and return */
+ lghi %r1,0x1000
+ spx 0x318(%r1)
+ lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15)
+ lghi %r2,0
+ br %r14
+
+/*
+ * Restore saved memory image to correct place and restore register context.
+ * Then we return to the function that called swsusp_arch_suspend().
+ * swsusp_arch_resume() runs with disabled interrupts.
+ */
+ .globl swsusp_arch_resume
+swsusp_arch_resume:
+ stmg %r6,%r15,__SF_GPRS(%r15)
+ lgr %r1,%r15
+ aghi %r15,-STACK_FRAME_OVERHEAD
+ stg %r1,__SF_BACKCHAIN(%r15)
+
+ /* Save boot cpu number */
+ brasl %r14,smp_get_phys_cpu_id
+ lgr %r10,%r2
+
+ /* Deactivate DAT */
+ stnsm __SF_EMPTY(%r15),0xfb
+
+ /* Switch off lowcore protection */
+ stctg %c0,%c0,__SF_EMPTY(%r15)
+ ni __SF_EMPTY+4(%r15),0xef
+ lctlg %c0,%c0,__SF_EMPTY(%r15)
+
+ /* Set prefix page to zero */
+ xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15)
+ spx __SF_EMPTY(%r15)
+
+ /* Restore saved image */
+ larl %r1,restore_pblist
+ lg %r1,0(%r1)
+ ltgr %r1,%r1
+ jz 2f
+0:
+ lg %r2,8(%r1)
+ lg %r4,0(%r1)
+ lghi %r3,PAGE_SIZE
+ lghi %r5,PAGE_SIZE
+1:
+ mvcle %r2,%r4,0
+ jo 1b
+ lg %r1,16(%r1)
+ ltgr %r1,%r1
+ jnz 0b
+2:
+ ptlb /* flush tlb */
+
+ /* Restore registers */
+ lghi %r13,0x1000 /* %r1 = pointer to save arae */
+
+ spt 0x328(%r13) /* reprogram timer */
+ //sckc 0x330(%r13) /* set clock comparator */
+
+ lctlg %c0,%c15,0x380(%r13) /* load control registers */
+ lam %a0,%a15,0x340(%r13) /* load access registers */
+
+ lfpc 0x31c(%r13) /* load fpu control */
+ ld 0,0x200(%r13) /* load f0 */
+ ld 1,0x208(%r13) /* load f1 */
+ ld 2,0x210(%r13) /* load f2 */
+ ld 3,0x218(%r13) /* load f3 */
+ ld 4,0x220(%r13) /* load f4 */
+ ld 5,0x228(%r13) /* load f5 */
+ ld 6,0x230(%r13) /* load f6 */
+ ld 7,0x238(%r13) /* load f7 */
+ ld 8,0x240(%r13) /* load f8 */
+ ld 9,0x248(%r13) /* load f9 */
+ ld 10,0x250(%r13) /* load f10 */
+ ld 11,0x258(%r13) /* load f11 */
+ ld 12,0x260(%r13) /* load f12 */
+ ld 13,0x268(%r13) /* load f13 */
+ ld 14,0x270(%r13) /* load f14 */
+ ld 15,0x278(%r13) /* load f15 */
+
+ /* Load old stack */
+ lg %r15,0x2f8(%r13)
+
+ /* Pointer to save arae */
+ lghi %r13,0x1000
+
+ /* Switch CPUs */
+ lgr %r2,%r10 /* get cpu id */
+ llgf %r3,0x318(%r13)
+ brasl %r14,smp_switch_boot_cpu_in_resume
+
+ /* Restore prefix register */
+ spx 0x318(%r13)
+
+ /* Switch on lowcore protection */
+ stctg %c0,%c0,__SF_EMPTY(%r15)
+ oi __SF_EMPTY+4(%r15),0x10
+ lctlg %c0,%c0,__SF_EMPTY(%r15)
+
+ /* Activate DAT */
+ stosm __SF_EMPTY(%r15),0x04
+
+ /* Return 0 */
+ lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15)
+ lghi %r2,0
+ br %r14
git.openpandora.org / pandora-kernel.git / commitdiff