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linux/arch/parisc/kernel/head.S
Helge Deller a406b8b424 parisc: Prevent booting 64-bit kernels on PA1.x machines 
Bail out early with error message when trying to boot a 64-bit kernel on
32-bit machines. This fixes the previous commit to include the check for
true 64-bit kernels as well.

Signed-off-by: Helge Deller <deller@gmx.de>
Fixes: 591d2108f3 ("parisc: Add runtime check to prevent PA2.0 kernels on PA1.x machines")
Cc:  <stable@vger.kernel.org> # v6.0+
2023-11-10 16:17:32 +01:00

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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 <linux/linkage.h>
#include <linux/init.h>
#include <linux/pgtable.h>
.level 1.1
__INITDATA
ENTRY(boot_args)
.word 0 /* arg0 */
.word 0 /* arg1 */
.word 0 /* arg2 */
.word 0 /* arg3 */
END(boot_args)
__HEAD
.align 4
.import init_task,data
.import init_stack,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)
#if defined(CONFIG_PA20)
/* check for 64-bit capable CPU as required by current kernel */
ldi 32,%r10
mtctl %r10,%cr11
.level 2.0
mfctl,w %cr11,%r10
.level 1.1
comib,<>,n 0,%r10,$cpu_ok
load32 PA(msg1),%arg0
ldi msg1_end-msg1,%arg1
$iodc_panic:
copy %arg0, %r10
copy %arg1, %r11
load32 PA(init_stack),%sp
#define MEM_CONS 0x3A0
ldw MEM_CONS+32(%r0),%arg0 // HPA
ldi ENTRY_IO_COUT,%arg1
ldw MEM_CONS+36(%r0),%arg2 // SPA
ldw MEM_CONS+8(%r0),%arg3 // layers
load32 PA(__bss_start),%r1
stw %r1,-52(%sp) // arg4
stw %r0,-56(%sp) // arg5
stw %r10,-60(%sp) // arg6 = ptr to text
stw %r11,-64(%sp) // arg7 = len
stw %r0,-68(%sp) // arg8
load32 PA(.iodc_panic_ret), %rp
ldw MEM_CONS+40(%r0),%r1 // ENTRY_IODC
bv,n (%r1)
.iodc_panic_ret:
b . /* wait endless with ... */
or %r10,%r10,%r10 /* qemu idle sleep */
msg1: .ascii "Can't boot kernel which was built for PA8x00 CPUs on this machine.\r\n"
msg1_end:
$cpu_ok:
#endif
.level PA_ASM_LEVEL
/* 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_task,%r6
mtctl %r6,%cr30
/* And the stack pointer too */
load32 init_stack,%sp
tophys_r1 %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
#define MEM_PDC_LO 0x388
#define MEM_PDC_HI 0x35C
#ifdef CONFIG_64BIT
/* Get PDCE_PROC for monarch CPU. */
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
#ifdef CONFIG_HOTPLUG_CPU
/* common_stext is far away in another section... jump there */
load32 PA(common_stext), %rp
bv,n (%rp)
/* common_stext and smp_slave_stext needs to be in text section */
.text
#endif
/*
** 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
mfctl %cr30,%r6 /* PCX-W2 firmware bug */
tophys_r1 %r6
/* Save the rfi target address */
STREG %r11, TASK_PT_GR11(%r6)
/* 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:
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:
LDREG TASK_PT_GR11(%r6), %r11
tovirt_r1 %r6
mtctl %r6,%cr30 /* restore task thread info */
#endif
#ifndef CONFIG_64BIT
/* clear all BTLBs */
ldi PDC_BLOCK_TLB,%arg0
load32 PA(stext_pdc_btlb_ret), %rp
ldw MEM_PDC_LO(%r0),%r3
bv (%r3)
ldi PDC_BTLB_PURGE_ALL,%arg1
stext_pdc_btlb_ret:
#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
tovirt_r1 %sp
/* 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
#ifdef CONFIG_64BIT
/*
* Enable Wide mode early, in case the task_struct for the idle
* task in smp_init_current_idle_task was allocated above 4GB.
*/
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
2:
#endif
/* Initialize the SP - monarch sets up smp_init_current_idle_task */
load32 PA(smp_init_current_idle_task),%r6
LDREG 0(%r6),%r6
mtctl %r6,%cr30
tophys_r1 %r6
LDREG TASK_STACK(%r6),%sp
tophys_r1 %sp
ldo FRAME_SIZE(%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 */
#ifndef CONFIG_64BIT
.section .data..ro_after_init
.align 4
.export $global$,data
.type $global$,@object
.size $global$,4
$global$:
.word 0
#endif /*!CONFIG_64BIT*/
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