0,0 → 1,245 |
# |
# Copyright (c) 2005 Jakub Jermar |
# Copyright (c) 2008 Pavel Rimsky |
# All rights reserved. |
# |
# Redistribution and use in source and binary forms, with or without |
# modification, are permitted provided that the following conditions |
# are met: |
# |
# - Redistributions of source code must retain the above copyright |
# notice, this list of conditions and the following disclaimer. |
# - Redistributions in binary form must reproduce the above copyright |
# notice, this list of conditions and the following disclaimer in the |
# documentation and/or other materials provided with the distribution. |
# - The name of the author may not be used to endorse or promote products |
# derived from this software without specific prior written permission. |
# |
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
# |
|
#include <arch/arch.h> |
#include <arch/stack.h> |
#include <arch/sun4v/regdef.h> |
#include <arch/sun4v/hypercall.h> |
#include <arch/mm/sun4v/tte.h> |
#include <arch/mm/sun4v/mmu.h> |
#include <arch/mm/tlb.h> |
|
.register %g2, #scratch |
.register %g3, #scratch |
|
.section K_TEXT_START, "ax" |
|
#define BSP_FLAG 1 |
#define PHYSMEM_ADDR_SIZE 56 |
|
/* |
* SILO for an unknown reason loads the image to MAPPING_OFFSET + 0x4000 bytes |
* from the start of the physical memory. We pretend that the physical memory |
* starts MAPPING_OFFSET bytes further than it actually does. |
*/ |
#define MAPPING_OFFSET 0x400000 |
|
/* |
* Flags set in the TTE data entry mapping the kernel. |
*/ |
#ifdef CONFIG_VIRT_IDX_DCACHE |
#define TTE_FLAGS \ |
(1 << TTE_V_SHIFT) \ |
| (1 << TTE_EP_SHIFT) \ |
| (1 << TTE_CP_SHIFT) \ |
| (1 << TTE_CV_SHIFT) \ |
| (1 << TTE_P_SHIFT) \ |
| (1 << TTE_W_SHIFT) |
#else |
#define TTE_FLAGS \ |
(1 << TTE_V_SHIFT) \ |
| (1 << TTE_EP_SHIFT) \ |
| (1 << TTE_CP_SHIFT) \ |
| (1 << TTE_P_SHIFT) \ |
| (1 << TTE_W_SHIFT) |
#endif |
|
|
/* |
* Fills a register with a TTE Data item. The item will map the given virtual |
* address to a real address which will be computed by adding the starting |
* address of the physical memory to the virtual address. |
* |
* parameters: |
* addr: virtual address to be mapped |
* rphysmem_start: register containing the starting address of the |
* physical memory |
* rtmp1: a register to be used as temporary |
* rtmp2: a register to be used as temporary |
* rd: register where the result will be saved |
*/ |
#define TTE_DATA(addr, rphysmem_start, rtmp1, rtmp2, rd) \ |
setx TTE_FLAGS | PAGESIZE_4M, rtmp1, rd; \ |
add rd, rphysmem_start, rd; \ |
setx (addr), rtmp1, rtmp2; \ |
add rd, rtmp2, rd; |
|
/* |
* Here is where the kernel is passed control from the boot loader. |
* |
* The registers are expected to be in this state: |
* - %o0 starting address of physical memory + bootstrap processor flag |
* bits 63...1: physical memory starting address / 2 |
* bit 0: non-zero on BSP processor, zero on AP processors |
* - %o1 bootinfo structure address (BSP only) |
* - %o2 bootinfo structure size (BSP only) |
* |
* Moreover, we depend on boot having established the following environment: |
* - TLBs are on |
* - identity mapping for the kernel image |
*/ |
.global kernel_image_start |
kernel_image_start: |
mov BSP_FLAG, %l0 |
and %o0, %l0, %l7 ! l7 <= bootstrap processor? |
andn %o0, %l0, %l6 ! l6 <= start of physical memory |
or %o1, %g0, %l1 |
or %o2, %g0, %l2 |
|
! Get bits (PHYSMEM_ADDR_SIZE - 1):13 of physmem_base. |
srlx %l6, 13, %l5 |
|
! l5 <= physmem_base[(PHYSMEM_ADDR_SIZE - 1):13] |
sllx %l5, 13 + (63 - (PHYSMEM_ADDR_SIZE - 1)), %l5 |
srlx %l5, 63 - (PHYSMEM_ADDR_SIZE - 1), %l5 |
|
! pretend the physical memory starts further |
set MAPPING_OFFSET, %g2 |
add %l5, %g2, %l5 |
|
/* |
* Setup basic runtime environment. |
*/ |
wrpr %g0, NWINDOWS - 2, %cansave ! set maximum saveable windows |
wrpr %g0, 0, %canrestore ! get rid of windows we will |
! never need again |
wrpr %g0, 0, %otherwin ! make sure the window state is |
! consistent |
wrpr %g0, NWINDOWS - 1, %cleanwin ! prevent needless clean_window |
! traps for kernel |
|
wrpr %g0, 0, %wstate ! use default spill/fill trap |
|
wrpr %g0, 0, %tl ! TL = 0, primary context |
! register is used |
|
wrpr %g0, PSTATE_PRIV_BIT, %pstate ! disable interrupts and disable |
! 32-bit address masking |
|
wrpr %g0, 0, %pil ! intialize %pil |
|
/* |
* Switch to kernel trap table. |
*/ |
sethi %hi(trap_table), %g1 |
wrpr %g1, %lo(trap_table), %tba |
|
|
/* |
* Take over the MMU. |
*/ |
|
! map kernel in context 1 |
set kernel_image_start, %o0 ! virt. address |
set 1, %o1 ! context |
TTE_DATA(kernel_image_start, %l5, %g2, %g3, %o2) ! TTE data |
set MMU_FLAG_DTLB | MMU_FLAG_ITLB, %o3 ! MMU flags |
__HYPERCALL_HYPERFAST(MMU_MAP_ADDR) |
|
! switch to context 1 |
set 1, %o0 |
set VA_PRIMARY_CONTEXT_REG, %o1 |
stxa %o0, [%o1] ASI_PRIMARY_CONTEXT_REG |
|
! demap all in context 0 |
set 0, %o0 ! reserved |
set 0, %o1 ! reserved |
set 0, %o2 ! context |
set MMU_FLAG_DTLB | MMU_FLAG_ITLB, %o3 ! MMU flags |
__HYPERCALL_FAST(MMU_DEMAP_CTX) |
|
! install permanent mapping for kernel in context 0 |
set kernel_image_start, %o0 ! virtual address |
set 0, %o1 ! context |
TTE_DATA(kernel_image_start, %l5, %g2, %g3, %o2) ! TTE data |
set MMU_FLAG_DTLB | MMU_FLAG_ITLB, %o3 ! MMU flags |
__HYPERCALL_FAST(MMU_MAP_PERM_ADDR) |
|
! switch to context 0 |
mov 0, %o0 |
set VA_PRIMARY_CONTEXT_REG, %o1 |
stxa %o0, [%o1] ASI_PRIMARY_CONTEXT_REG |
|
! demap all in context 1 (cleanup) |
set 0, %o0 ! reserved |
set 0, %o1 ! reserved |
set 1, %o2 ! context |
set MMU_FLAG_DTLB | MMU_FLAG_ITLB, %o3 ! MMU flags |
__HYPERCALL_FAST(MMU_DEMAP_CTX) |
|
/* |
* Save physmem_base for use by the mm subsystem. |
* %l6 contains starting physical address |
*/ |
sethi %hi(physmem_base), %l4 |
stx %l6, [%l4 + %lo(physmem_base)] |
|
/* |
* So far, we have not touched the stack. |
* It is a good idea to set the kernel stack to a known state now. |
*/ |
sethi %hi(temporary_boot_stack), %sp |
or %sp, %lo(temporary_boot_stack), %sp |
sub %sp, STACK_BIAS, %sp |
|
or %l1, %g0, %o1 |
or %l2, %g0, %o2 |
sethi %hi(bootinfo), %o0 |
call memcpy ! copy bootinfo |
or %o0, %lo(bootinfo), %o0 |
|
call arch_pre_main |
nop |
|
call main_bsp |
nop |
|
/* Not reached. */ |
|
0: |
ba 0b |
nop |
|
.section K_DATA_START, "aw", @progbits |
|
#define INITIAL_STACK_SIZE 1024 |
|
.align STACK_ALIGNMENT |
.space INITIAL_STACK_SIZE |
.align STACK_ALIGNMENT |
temporary_boot_stack: |
.space STACK_WINDOW_SAVE_AREA_SIZE |
|
|
.data |
|
.align 8 |
.global physmem_base ! copy of the physical memory base address |
physmem_base: |
.quad 0 |