# # Copyright (c) 2006 Martin Decky # 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 "asm.h" #include "regname.h" .macro SMC_COHERENCY addr dcbst 0, \addr sync icbi 0, \addr sync isync .endm .macro FLUSH_DCACHE addr dcbst 0, \addr sync isync .endm .macro TLB_FLUSH reg tlbie \reg addi \reg, \reg, 0x1000 .endm .text .global halt .global memcpy .global jump_to_kernel halt: b halt memcpy: srwi. r7, r5, 3 addi r6, r3, -4 addi r4, r4, -4 beq 2f andi. r0, r6, 3 mtctr r7 bne 5f 1: lwz r7, 4(r4) lwzu r8, 8(r4) stw r7, 4(r6) stwu r8, 8(r6) bdnz 1b andi. r5, r5, 7 2: cmplwi 0, r5, 4 blt 3f lwzu r0, 4(r4) addi r5, r5, -4 stwu r0, 4(r6) 3: cmpwi 0, r5, 0 beqlr mtctr r5 addi r4, r4, 3 addi r6, r6, 3 4: lbzu r0, 1(r4) stbu r0, 1(r6) bdnz 4b blr 5: subfic r0, r0, 4 mtctr r0 6: lbz r7, 4(r4) addi r4, r4, 1 stb r7, 4(r6) addi r6, r6, 1 bdnz 6b subf r5, r0, r5 rlwinm. r7, r5, 32-3, 3, 31 beq 2b mtctr r7 b 1b jump_to_kernel: # r3 = bootinfo (pa) # r4 = bootinfo_size # r5 = trans (pa) # r6 = bytes to copy # r7 = real_mode (pa) # r8 = framebuffer (pa) # r9 = scanline # disable interrupts mfmsr r31 rlwinm r31, r31, 0, 17, 15 mtmsr r31 # set real_mode meeting point address mtspr srr0, r7 # jumps to real_mode mfmsr r31 lis r30, ~0@h ori r30, r30, ~(msr_ir | msr_dr | msr_ee)@l and r31, r31, r30 mtspr srr1, r31 sync isync rfi .section REALMODE, "ax" .align PAGE_WIDTH .global real_mode real_mode: # copy kernel to proper location # # r5 = trans (pa) # r6 = bytes to copy # r8 = framebuffer (pa) # r9 = scanline li r31, PAGE_SIZE >> 2 li r30, 0 page_copy: cmpwi r6, 0 beq copy_end # copy page mtctr r31 lwz r29, 0(r5) copy_loop: lwz r28, 0(r29) stw r28, 0(r30) SMC_COHERENCY r30 addi r29, r29, 4 addi r30, r30, 4 subi r6, r6, 4 cmpwi r6, 0 beq copy_end bdnz copy_loop addi r5, r5, 4 b page_copy copy_end: # initially fill segment registers li r31, 0 li r29, 8 mtctr r29 li r30, 0 # ASID 0 (VSIDs 0 .. 7) seg_fill_uspace: mtsrin r30, r31 addi r30, r30, 1 addis r31, r31, 0x1000 # move to next SR bdnz seg_fill_uspace li r29, 8 mtctr r29 lis r30, 0x4000 # priviledged access only ori r30, r30, 8 # ASID 0 (VSIDs 8 .. 15) seg_fill_kernel: mtsrin r30, r31 addi r30, r30, 1 addis r31, r31, 0x1000 # move to next SR bdnz seg_fill_kernel # invalidate block address translation registers li r30, 0 mtspr ibat0u, r30 mtspr ibat0l, r30 mtspr ibat1u, r30 mtspr ibat1l, r30 mtspr ibat2u, r30 mtspr ibat2l, r30 mtspr ibat3u, r30 mtspr ibat3l, r30 mtspr dbat0u, r30 mtspr dbat0l, r30 mtspr dbat1u, r30 mtspr dbat1l, r30 mtspr dbat2u, r30 mtspr dbat2l, r30 mtspr dbat3u, r30 mtspr dbat3l, r30 # create empty Page Hash Table # on top of memory, size 64 KB lwz r31, 0(r3) # r31 = memory size lis r30, 65536@h ori r30, r30, 65536@l # r30 = 65536 subi r29, r30, 1 # r29 = 65535 sub r31, r31, r30 andc r31, r31, r29 # pht = ALIGN_DOWN(memory_size - 65536, 65536) mtsdr1 r31 li r29, 2 srw r30, r30, r29 # r30 = 16384 li r29, 0 pht_clear: # write zeroes stw r29, 0(r31) FLUSH_DCACHE r31 addi r31, r31, 4 subi r30, r30, 4 cmpwi r30, 0 beq clear_end bdnz pht_clear clear_end: #ifdef CONFIG_BAT # create BAT identity mapping lwz r31, 0(r3) # r31 = memory size lis r29, 0x0002 cmpw r31, r29 blt no_bat # less than 128 KB -> no BAT li r29, 18 srw r31, r31, r29 # r31 = total >> 18 # create Block Length mask by replicating # the leading logical one 14 times li r29, 14 mtctr r31 li r29, 1 bat_mask: srw r30, r31, r29 # r30 = mask >> 1 or r31, r31, r30 # mask = mask | r30 bdnz bat_mask andi. r31, r31, 0x07ff # mask = mask & 0x07ff (BAT can map up to 256 MB) li r29, 2 slw r31, r31, r29 # mask = mask << 2 ori r31, r31, 0x0002 # mask = mask | 0x0002 (priviledged access only) lis r29, 0x8000 or r29, r29, r31 lis r30, 0x0000 ori r30, r30, 0x0002 mtspr ibat0u, r29 mtspr ibat0l, r30 mtspr dbat0u, r29 mtspr dbat0l, r30 no_bat: #endif # flush TLB li r31, 0 sync TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 TLB_FLUSH r31 eieio tlbsync sync # start the kernel # # pc = KERNEL_START_ADDR # r3 = bootinfo (pa) # sprg0 = KA2PA(KERNEL_START_ADDR) # sprg3 = physical memory size # sp = 0 (pa) lis r31, KERNEL_START_ADDR@ha addi r31, r31, KERNEL_START_ADDR@l mtspr srr0, r31 subis r31, r31, 0x8000 mtsprg0 r31 lwz r31, 0(r3) mtsprg3 r31 li sp, 0 mfmsr r31 ori r31, r31, (msr_ir | msr_dr)@l mtspr srr1, r31 sync isync rfi .align PAGE_WIDTH .global trans trans: .space (TRANS_SIZE * TRANS_ITEM_SIZE)