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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/parisc/kernel/head.S
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/parisc/kernel/head.S')
-rw-r--r--arch/parisc/kernel/head.S358
1 files changed, 358 insertions, 0 deletions
diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S
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+/* This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1999-2007 by Helge Deller <deller@gmx.de>
+ * Copyright 1999 SuSE GmbH (Philipp Rumpf)
+ * Copyright 1999 Philipp Rumpf (prumpf@tux.org)
+ * Copyright 2000 Hewlett Packard (Paul Bame, bame@puffin.external.hp.com)
+ * Copyright (C) 2001 Grant Grundler (Hewlett Packard)
+ * Copyright (C) 2004 Kyle McMartin <kyle@debian.org>
+ *
+ * Initial Version 04-23-1999 by Helge Deller <deller@gmx.de>
+ */
+
+#include <asm/asm-offsets.h>
+#include <asm/psw.h>
+#include <asm/pdc.h>
+
+#include <asm/assembly.h>
+#include <asm/pgtable.h>
+
+#include <linux/linkage.h>
+#include <linux/init.h>
+
+ .level LEVEL
+
+ __INITDATA
+ENTRY(boot_args)
+ .word 0 /* arg0 */
+ .word 0 /* arg1 */
+ .word 0 /* arg2 */
+ .word 0 /* arg3 */
+END(boot_args)
+
+ __HEAD
+
+ .align 4
+ .import init_thread_union,data
+ .import fault_vector_20,code /* IVA parisc 2.0 32 bit */
+#ifndef CONFIG_64BIT
+ .import fault_vector_11,code /* IVA parisc 1.1 32 bit */
+ .import $global$ /* forward declaration */
+#endif /*!CONFIG_64BIT*/
+ .export _stext,data /* Kernel want it this way! */
+_stext:
+ENTRY(stext)
+ .proc
+ .callinfo
+
+ /* Make sure sr4-sr7 are set to zero for the kernel address space */
+ mtsp %r0,%sr4
+ mtsp %r0,%sr5
+ mtsp %r0,%sr6
+ mtsp %r0,%sr7
+
+ /* Clear BSS (shouldn't the boot loader do this?) */
+
+ .import __bss_start,data
+ .import __bss_stop,data
+
+ load32 PA(__bss_start),%r3
+ load32 PA(__bss_stop),%r4
+$bss_loop:
+ cmpb,<<,n %r3,%r4,$bss_loop
+ stw,ma %r0,4(%r3)
+
+ /* Save away the arguments the boot loader passed in (32 bit args) */
+ load32 PA(boot_args),%r1
+ stw,ma %arg0,4(%r1)
+ stw,ma %arg1,4(%r1)
+ stw,ma %arg2,4(%r1)
+ stw,ma %arg3,4(%r1)
+
+ /* Initialize startup VM. Just map first 8/16 MB of memory */
+ load32 PA(swapper_pg_dir),%r4
+ mtctl %r4,%cr24 /* Initialize kernel root pointer */
+ mtctl %r4,%cr25 /* Initialize user root pointer */
+
+#if PT_NLEVELS == 3
+ /* Set pmd in pgd */
+ load32 PA(pmd0),%r5
+ shrd %r5,PxD_VALUE_SHIFT,%r3
+ ldo (PxD_FLAG_PRESENT+PxD_FLAG_VALID)(%r3),%r3
+ stw %r3,ASM_PGD_ENTRY*ASM_PGD_ENTRY_SIZE(%r4)
+ ldo ASM_PMD_ENTRY*ASM_PMD_ENTRY_SIZE(%r5),%r4
+#else
+ /* 2-level page table, so pmd == pgd */
+ ldo ASM_PGD_ENTRY*ASM_PGD_ENTRY_SIZE(%r4),%r4
+#endif
+
+ /* Fill in pmd with enough pte directories */
+ load32 PA(pg0),%r1
+ SHRREG %r1,PxD_VALUE_SHIFT,%r3
+ ldo (PxD_FLAG_PRESENT+PxD_FLAG_VALID)(%r3),%r3
+
+ ldi ASM_PT_INITIAL,%r1
+
+1:
+ stw %r3,0(%r4)
+ ldo (PAGE_SIZE >> PxD_VALUE_SHIFT)(%r3),%r3
+ addib,> -1,%r1,1b
+#if PT_NLEVELS == 3
+ ldo ASM_PMD_ENTRY_SIZE(%r4),%r4
+#else
+ ldo ASM_PGD_ENTRY_SIZE(%r4),%r4
+#endif
+
+
+ /* Now initialize the PTEs themselves. We use RWX for
+ * everything ... it will get remapped correctly later */
+ ldo 0+_PAGE_KERNEL_RWX(%r0),%r3 /* Hardwired 0 phys addr start */
+ ldi (1<<(KERNEL_INITIAL_ORDER-PAGE_SHIFT)),%r11 /* PFN count */
+ load32 PA(pg0),%r1
+
+$pgt_fill_loop:
+ STREGM %r3,ASM_PTE_ENTRY_SIZE(%r1)
+ ldo (1<<PFN_PTE_SHIFT)(%r3),%r3 /* add one PFN */
+ addib,> -1,%r11,$pgt_fill_loop
+ nop
+
+ /* Load the return address...er...crash 'n burn */
+ copy %r0,%r2
+
+ /* And the RFI Target address too */
+ load32 start_parisc,%r11
+
+ /* And the initial task pointer */
+ load32 init_thread_union,%r6
+ mtctl %r6,%cr30
+
+ /* And the stack pointer too */
+ ldo THREAD_SZ_ALGN(%r6),%sp
+
+#ifdef CONFIG_SMP
+ /* Set the smp rendezvous address into page zero.
+ ** It would be safer to do this in init_smp_config() but
+ ** it's just way easier to deal with here because
+ ** of 64-bit function ptrs and the address is local to this file.
+ */
+ load32 PA(smp_slave_stext),%r10
+ stw %r10,0x10(%r0) /* MEM_RENDEZ */
+ stw %r0,0x28(%r0) /* MEM_RENDEZ_HI - assume addr < 4GB */
+
+ /* FALLTHROUGH */
+ .procend
+
+ /*
+ ** Code Common to both Monarch and Slave processors.
+ ** Entry:
+ **
+ ** 1.1:
+ ** %r11 must contain RFI target address.
+ ** %r25/%r26 args to pass to target function
+ ** %r2 in case rfi target decides it didn't like something
+ **
+ ** 2.0w:
+ ** %r3 PDCE_PROC address
+ ** %r11 RFI target address
+ **
+ ** Caller must init: SR4-7, %sp, %r10, %cr24/25,
+ */
+common_stext:
+ .proc
+ .callinfo
+#else
+ /* Clear PDC entry point - we won't use it */
+ stw %r0,0x10(%r0) /* MEM_RENDEZ */
+ stw %r0,0x28(%r0) /* MEM_RENDEZ_HI */
+#endif /*CONFIG_SMP*/
+
+#ifdef CONFIG_64BIT
+ tophys_r1 %sp
+
+ /* Save the rfi target address */
+ ldd TI_TASK-THREAD_SZ_ALGN(%sp), %r10
+ tophys_r1 %r10
+ std %r11, TASK_PT_GR11(%r10)
+ /* Switch to wide mode Superdome doesn't support narrow PDC
+ ** calls.
+ */
+1: mfia %rp /* clear upper part of pcoq */
+ ldo 2f-1b(%rp),%rp
+ depdi 0,31,32,%rp
+ bv (%rp)
+ ssm PSW_SM_W,%r0
+
+ /* Set Wide mode as the "Default" (eg for traps)
+ ** First trap occurs *right* after (or part of) rfi for slave CPUs.
+ ** Someday, palo might not do this for the Monarch either.
+ */
+2:
+#define MEM_PDC_LO 0x388
+#define MEM_PDC_HI 0x35C
+ ldw MEM_PDC_LO(%r0),%r3
+ ldw MEM_PDC_HI(%r0),%r6
+ depd %r6, 31, 32, %r3 /* move to upper word */
+
+ ldo PDC_PSW(%r0),%arg0 /* 21 */
+ ldo PDC_PSW_SET_DEFAULTS(%r0),%arg1 /* 2 */
+ ldo PDC_PSW_WIDE_BIT(%r0),%arg2 /* 2 */
+ load32 PA(stext_pdc_ret), %rp
+ bv (%r3)
+ copy %r0,%arg3
+
+stext_pdc_ret:
+ /* restore rfi target address*/
+ ldd TI_TASK-THREAD_SZ_ALGN(%sp), %r10
+ tophys_r1 %r10
+ ldd TASK_PT_GR11(%r10), %r11
+ tovirt_r1 %sp
+#endif
+
+ /* PARANOID: clear user scratch/user space SR's */
+ mtsp %r0,%sr0
+ mtsp %r0,%sr1
+ mtsp %r0,%sr2
+ mtsp %r0,%sr3
+
+ /* Initialize Protection Registers */
+ mtctl %r0,%cr8
+ mtctl %r0,%cr9
+ mtctl %r0,%cr12
+ mtctl %r0,%cr13
+
+ /* Initialize the global data pointer */
+ loadgp
+
+ /* Set up our interrupt table. HPMCs might not work after this!
+ *
+ * We need to install the correct iva for PA1.1 or PA2.0. The
+ * following short sequence of instructions can determine this
+ * (without being illegal on a PA1.1 machine).
+ */
+#ifndef CONFIG_64BIT
+ ldi 32,%r10
+ mtctl %r10,%cr11
+ .level 2.0
+ mfctl,w %cr11,%r10
+ .level 1.1
+ comib,<>,n 0,%r10,$is_pa20
+ ldil L%PA(fault_vector_11),%r10
+ b $install_iva
+ ldo R%PA(fault_vector_11)(%r10),%r10
+
+$is_pa20:
+ .level LEVEL /* restore 1.1 || 2.0w */
+#endif /*!CONFIG_64BIT*/
+ load32 PA(fault_vector_20),%r10
+
+$install_iva:
+ mtctl %r10,%cr14
+
+ b aligned_rfi /* Prepare to RFI! Man all the cannons! */
+ nop
+
+ .align 128
+aligned_rfi:
+ pcxt_ssm_bug
+
+ rsm PSW_SM_QUIET,%r0 /* off troublesome PSW bits */
+ /* Don't need NOPs, have 8 compliant insn before rfi */
+
+ mtctl %r0,%cr17 /* Clear IIASQ tail */
+ mtctl %r0,%cr17 /* Clear IIASQ head */
+
+ /* Load RFI target into PC queue */
+ mtctl %r11,%cr18 /* IIAOQ head */
+ ldo 4(%r11),%r11
+ mtctl %r11,%cr18 /* IIAOQ tail */
+
+ load32 KERNEL_PSW,%r10
+ mtctl %r10,%ipsw
+
+ /* Jump through hyperspace to Virt Mode */
+ rfi
+ nop
+
+ .procend
+
+#ifdef CONFIG_SMP
+
+ .import smp_init_current_idle_task,data
+ .import smp_callin,code
+
+#ifndef CONFIG_64BIT
+smp_callin_rtn:
+ .proc
+ .callinfo
+ break 1,1 /* Break if returned from start_secondary */
+ nop
+ nop
+ .procend
+#endif /*!CONFIG_64BIT*/
+
+/***************************************************************************
+* smp_slave_stext is executed by all non-monarch Processors when the Monarch
+* pokes the slave CPUs in smp.c:smp_boot_cpus().
+*
+* Once here, registers values are initialized in order to branch to virtual
+* mode. Once all available/eligible CPUs are in virtual mode, all are
+* released and start out by executing their own idle task.
+*****************************************************************************/
+smp_slave_stext:
+ .proc
+ .callinfo
+
+ /*
+ ** Initialize Space registers
+ */
+ mtsp %r0,%sr4
+ mtsp %r0,%sr5
+ mtsp %r0,%sr6
+ mtsp %r0,%sr7
+
+ /* Initialize the SP - monarch sets up smp_init_current_idle_task */
+ load32 PA(smp_init_current_idle_task),%sp
+ LDREG 0(%sp),%sp /* load task address */
+ tophys_r1 %sp
+ LDREG TASK_THREAD_INFO(%sp),%sp
+ mtctl %sp,%cr30 /* store in cr30 */
+ ldo THREAD_SZ_ALGN(%sp),%sp
+
+ /* point CPU to kernel page tables */
+ load32 PA(swapper_pg_dir),%r4
+ mtctl %r4,%cr24 /* Initialize kernel root pointer */
+ mtctl %r4,%cr25 /* Initialize user root pointer */
+
+#ifdef CONFIG_64BIT
+ /* Setup PDCE_PROC entry */
+ copy %arg0,%r3
+#else
+ /* Load RFI *return* address in case smp_callin bails */
+ load32 smp_callin_rtn,%r2
+#endif
+
+ /* Load RFI target address. */
+ load32 smp_callin,%r11
+
+ /* ok...common code can handle the rest */
+ b common_stext
+ nop
+
+ .procend
+#endif /* CONFIG_SMP */
+
+ENDPROC(stext)
+
+#ifndef CONFIG_64BIT
+ .section .data..read_mostly
+
+ .align 4
+ .export $global$,data
+
+ .type $global$,@object
+ .size $global$,4
+$global$:
+ .word 0
+#endif /*!CONFIG_64BIT*/