Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 375 insertions, 0 deletions

diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S
new file mode 100644
index 000000000..f56cbab64
--- /dev/null
+++ b/arch/parisc/kernel/head.S
@@ -0,0 +1,375 @@
+/* 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	PA_ASM_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*/
+ENTRY(parisc_kernel_start)
+	.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 16/32 MB of memory */
+	load32		PA(swapper_pg_dir),%r4
+	mtctl		%r4,%cr24	/* Initialize kernel root pointer */
+	mtctl		%r4,%cr25	/* Initialize user root pointer */
+
+#if CONFIG_PGTABLE_LEVELS == 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 CONFIG_PGTABLE_LEVELS == 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 */
+	load32		(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
+
+#if defined(CONFIG_64BIT) && defined(CONFIG_FUNCTION_TRACER)
+	.import _mcount,data
+	/* initialize mcount FPTR */
+	/* Get the global data pointer */
+	loadgp
+	load32		PA(_mcount), %r10
+	std		%dp,0x18(%r10)
+#endif
+
+#ifdef CONFIG_64BIT
+	/* Get PDCE_PROC for monarch CPU. */
+#define MEM_PDC_LO 0x388
+#define MEM_PDC_HI 0x35C
+	ldw             MEM_PDC_LO(%r0),%r3
+	ldw             MEM_PDC_HI(%r0),%r10
+	depd            %r10, 31, 32, %r3        /* move to upper word */
+#endif
+
+
+#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:
+	mfctl		%cr30,%r6		/* PCX-W2 firmware bug */
+
+	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:
+	mtctl		%r6,%cr30		/* restore task thread info */
+
+	/* 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		PA_ASM_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
+
+	copy		%r3, %arg0	/* PDCE_PROC for smp_callin() */
+
+	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(parisc_kernel_start)
+
+#ifndef CONFIG_64BIT
+	.section .data..read_mostly
+
+	.align	4
+	.export	$global$,data
+
+	.type	$global$,@object
+	.size	$global$,4
+$global$:	
+	.word 0
+#endif /*!CONFIG_64BIT*/