/* * Copyright 2011 Tilera Corporation. All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. * * copy new kernel into place and then call hv_reexec * */ #include #include #include #include #undef RELOCATE_NEW_KERNEL_VERBOSE STD_ENTRY(relocate_new_kernel) move r30, r0 /* page list */ move r31, r1 /* address of page we are on */ move r32, r2 /* start address of new kernel */ shrui r1, r1, PAGE_SHIFT addi r1, r1, 1 shli sp, r1, PAGE_SHIFT addi sp, sp, -8 /* we now have a stack (whether we need one or not) */ #ifdef RELOCATE_NEW_KERNEL_VERBOSE moveli r40, hw2_last(hv_console_putc) shl16insli r40, r40, hw1(hv_console_putc) shl16insli r40, r40, hw0(hv_console_putc) moveli r0, 'r' jalr r40 moveli r0, '_' jalr r40 moveli r0, 'n' jalr r40 moveli r0, '_' jalr r40 moveli r0, 'k' jalr r40 moveli r0, '\n' jalr r40 #endif /* * Throughout this code r30 is pointer to the element of page * list we are working on. * * Normally we get to the next element of the page list by * incrementing r30 by eight. The exception is if the element * on the page list is an IND_INDIRECTION in which case we use * the element with the low bits masked off as the new value * of r30. * * To get this started, we need the value passed to us (which * will always be an IND_INDIRECTION) in memory somewhere with * r30 pointing at it. To do that, we push the value passed * to us on the stack and make r30 point to it. */ st sp, r30 move r30, sp addi sp, sp, -16 /* * On TILE-GX, we need to flush all tiles' caches, since we may * have been doing hash-for-home caching there. Note that we * must do this _after_ we're completely done modifying any memory * other than our output buffer (which we know is locally cached). * We want the caches to be fully clean when we do the reexec, * because the hypervisor is going to do this flush again at that * point, and we don't want that second flush to overwrite any memory. */ { move r0, zero /* cache_pa */ moveli r1, hw2_last(HV_FLUSH_EVICT_L2) } { shl16insli r1, r1, hw1(HV_FLUSH_EVICT_L2) movei r2, -1 /* cache_cpumask; -1 means all client tiles */ } { shl16insli r1, r1, hw0(HV_FLUSH_EVICT_L2) /* cache_control */ move r3, zero /* tlb_va */ } { move r4, zero /* tlb_length */ move r5, zero /* tlb_pgsize */ } { move r6, zero /* tlb_cpumask */ move r7, zero /* asids */ } { moveli r20, hw2_last(hv_flush_remote) move r8, zero /* asidcount */ } shl16insli r20, r20, hw1(hv_flush_remote) shl16insli r20, r20, hw0(hv_flush_remote) jalr r20 /* r33 is destination pointer, default to zero */ moveli r33, 0 .Lloop: ld r10, r30 andi r9, r10, 0xf /* low 4 bits tell us what type it is */ xor r10, r10, r9 /* r10 is now value with low 4 bits stripped */ cmpeqi r0, r9, 0x1 /* IND_DESTINATION */ beqzt r0, .Ltry2 move r33, r10 #ifdef RELOCATE_NEW_KERNEL_VERBOSE moveli r0, 'd' jalr r40 #endif addi r30, r30, 8 j .Lloop .Ltry2: cmpeqi r0, r9, 0x2 /* IND_INDIRECTION */ beqzt r0, .Ltry4 move r30, r10 #ifdef RELOCATE_NEW_KERNEL_VERBOSE moveli r0, 'i' jalr r40 #endif j .Lloop .Ltry4: cmpeqi r0, r9, 0x4 /* IND_DONE */ beqzt r0, .Ltry8 mf #ifdef RELOCATE_NEW_KERNEL_VERBOSE moveli r0, 'D' jalr r40 moveli r0, '\n' jalr r40 #endif move r0, r32 moveli r41, hw2_last(hv_reexec) shl16insli r41, r41, hw1(hv_reexec) shl16insli r41, r41, hw0(hv_reexec) jalr r41 /* we should not get here */ #ifdef RELOCATE_NEW_KERNEL_VERBOSE moveli r0, '?' jalr r40 moveli r0, '\n' jalr r40 #endif j .Lhalt .Ltry8: cmpeqi r0, r9, 0x8 /* IND_SOURCE */ beqz r0, .Lerr /* unknown type */ /* copy page at r10 to page at r33 */ move r11, r33 moveli r0, hw2_last(PAGE_SIZE) shl16insli r0, r0, hw1(PAGE_SIZE) shl16insli r0, r0, hw0(PAGE_SIZE) add r33, r33, r0 /* copy word at r10 to word at r11 until r11 equals r33 */ /* We know page size must be multiple of 8, so we can unroll * 8 times safely without any edge case checking. * * Issue a flush of the destination every 8 words to avoid * incoherence when starting the new kernel. (Now this is * just good paranoia because the hv_reexec call will also * take care of this.) */ 1: { ld r0, r10; addi r10, r10, 8 } { st r11, r0; addi r11, r11, 8 } { ld r0, r10; addi r10, r10, 8 } { st r11, r0; addi r11, r11, 8 } { ld r0, r10; addi r10, r10, 8 } { st r11, r0; addi r11, r11, 8 } { ld r0, r10; addi r10, r10, 8 } { st r11, r0; addi r11, r11, 8 } { ld r0, r10; addi r10, r10, 8 } { st r11, r0; addi r11, r11, 8 } { ld r0, r10; addi r10, r10, 8 } { st r11, r0; addi r11, r11, 8 } { ld r0, r10; addi r10, r10, 8 } { st r11, r0; addi r11, r11, 8 } { ld r0, r10; addi r10, r10, 8 } { st r11, r0 } { flush r11 ; addi r11, r11, 8 } cmpeq r0, r33, r11 beqzt r0, 1b #ifdef RELOCATE_NEW_KERNEL_VERBOSE moveli r0, 's' jalr r40 #endif addi r30, r30, 8 j .Lloop .Lerr: #ifdef RELOCATE_NEW_KERNEL_VERBOSE moveli r0, 'e' jalr r40 moveli r0, 'r' jalr r40 moveli r0, 'r' jalr r40 moveli r0, '\n' jalr r40 #endif .Lhalt: moveli r41, hw2_last(hv_halt) shl16insli r41, r41, hw1(hv_halt) shl16insli r41, r41, hw0(hv_halt) jalr r41 STD_ENDPROC(relocate_new_kernel) .section .rodata,"a" .globl relocate_new_kernel_size relocate_new_kernel_size: .long .Lend_relocate_new_kernel - relocate_new_kernel