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/*
* Copyright (c) 2007 Dietmar Hahn <dietmar.hahn@fujitsu-siemens.com>
*
*****************************************************************************
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <mini-os/asm.h>
#include <mini-os/page.h>
#include <mini-os/ia64_cpu.h>
#include <mini-os/ia64_fpu.h>
#include <mini-os/privop.h>
#include <mini-os/offsets.h>
/*
* Allocate kernel stack area.
* This is used for stack pointer (goes down from kstack+PAGE_SIZE) and
* RSE (goes up from kstack).
*/
.section .data.start,"aw"
.global kstack
.align PAGE_SIZE
kstack: .space KSTACK_PAGES * PAGE_SIZE
.text
/*
* Start the kernel.
* r28 points to the address of the boot parameter area, given
* from the bootloader.
* Execution reaches here in physical mode.
*/
ENTRY(_start)
.prologue
.save rp, r0 // terminate unwind chain with a NULL rp
.body
alloc loc0=ar.pfs,0,1,1,0
rsm psr.i | psr.ic
;;
srlz.i
;;
/*
* Initialize mini-os region registers:
* Currently only region registers 5 and 7 are used for addressing.
* rr[5] : virtual kernel address space
* rr[7] : directly mapped physically addresses.
*/
movl r2=0<<IA64_RR_IDX_POS
movl r3=1<<IA64_RR_IDX_POS
;;
mov rr[r2]=r0
mov rr[r3]=r0
;;
movl r2=2<<IA64_RR_IDX_POS
movl r3=3<<IA64_RR_IDX_POS
;;
mov rr[r2]=r0
mov rr[r3]=r0
;;
movl r2=4<<IA64_RR_IDX_POS
movl r3=6<<IA64_RR_IDX_POS
;;
mov rr[r2]=r0
mov rr[r3]=r0
;;
// Wired memory for kernel data and text.
movl r2=IA64_RR_VAL(KERNEL_TR_PAGE_SIZE,0)
movl r3=5<<IA64_RR_IDX_POS // region 5
;;
mov rr[r3]=r2
;;
/*
* Region 7 addresses are only for directly mapped physically
* addresses.
*/
movl r2=IA64_RR_VAL(PTE_PS_16K,0)
movl r3=7<<IA64_RR_IDX_POS // region 7
;;
mov rr[r3]=r2
;;
/*
* Setup protection keys for region 5 and 7.
*/
mov r2=(IA64_KEY_REG5 << IA64_PKR_KEY) | IA64_PKR_VALID
mov r3=(IA64_KEY_REG7 << IA64_PKR_KEY) | IA64_PKR_VALID
mov r14=0x1
;;
mov pkr[r0]=r2 /* Region 5 */
mov pkr[r14]=r3 /* Region 7 */
;;
/*
* Now pin mappings into the TLB for kernel text and data
*/
mov r18=(KERNEL_TR_PAGE_SIZE<<IA64_ITIR_PS)| \
(IA64_KEY_REG5<<IA64_ITIR_KEY)
movl r17=KERNEL_START
;;
mov cr.itir=r18
mov cr.ifa=r17
mov r16=IA64_TR_KERNEL
mov r3=ip
movl r18=PTE_KERNEL_ATTR
;;
dep r2=0,r3,0,KERNEL_TR_PAGE_SIZE
;;
or r18=r2,r18
;;
srlz.i
;;
itr.i itr[r16]=r18
;;
itr.d dtr[r16]=r18
;;
srlz.i
/* Switch into virtual mode */
movl r16=STARTUP_PSR
;;
mov cr.ipsr=r16
movl r17=1f
;;
mov cr.iip=r17
mov cr.ifs=r0
;;
rfi
;;
1: /* now we are in virtual mode */
movl r3=ia64_trap_table
;;
mov cr.iva=r3
;;
movl r2=IA64_FPSR_DEFAULT
movl r3=IA64_DCR_DEFAULT
;;
srlz.i
movl gp=__gp
mov ar.fpsr=r2
mov cr.dcr=r3
;;
movl r2=kstack
movl r5=KSTACK_PAGES * PAGE_SIZE - 16
mov ar.rsc=0 // place RSE in enforced lazy mode
;;
loadrs // clear the dirty partition
;;
mov ar.bspstore=r2 // establish the new RSE stack
add sp=r2,r5
;;
mov ar.rsc=IA64_RSE_EAGER // place RSE in eager mode
;;
movl r2=ia64_boot_paramP
mov r3=7 // make address virtual region 7.
;;
dep r28=r3,r28,61,3
;;
// save the address of the boot param area
// passed by the bootloader
st8 [r2]=r28
;;
/* Set xsi base. I use here XSI_BASE. */
#define FW_HYPERCALL_SET_SHARED_INFO_VA 0x600
mov r2=FW_HYPERCALL_SET_SHARED_INFO_VA
movl r28=XSI_BASE
;;
break 0x1000
;;
/*
* I set up here the pointer to the global start_info structure.
* This structure will be initialized in arch_init().
*/
movl out0=start_info_union
// Prepare out0 - the pointer to start_info_t.
movl r14=XSI_BASE
;;
add r15=START_INFO_PFN,r14 // add offset to XSI_BASE
;;
START_INFO_PFN_ld r14=[r15] // load the start_info_pfn
add r16=7, r0
;;
shl r15=r14,PAGE_SHIFT_XEN_16K // pfn << PAGE_SHIFT_XEN_16K
shl r16=r16,IA64_RR_IDX_POS // (7<<IA64_RR_IDX_POS)
;;
or out0=r16, r15 // make a region 7 address
;;
ssm psr.i | psr.ic
;;
srlz.i
;;
br.call.sptk.many rp=start_kernel
;;
add r2=3,r0
;;
ld8 r3=[r2]
;;
self: hint @pause
br.sptk.many self // endless loop
END(_start)
ENTRY(do_nop)
nop 0x01
add r15=1,r15
br.ret.sptk.many rp
END(do_nop)
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