diff options
author | marius <marius@FreeBSD.org> | 2008-09-10 20:07:08 +0000 |
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committer | marius <marius@FreeBSD.org> | 2008-09-10 20:07:08 +0000 |
commit | 5f92bd8a2360a9a7bab3592599efa577544cf5d7 (patch) | |
tree | 28413c3fa92c264113c015c6418ca5c5a892ea23 /sys/boot | |
parent | 83b4eaaa16e7c110ff0e856c2aa4084fb5e7564f (diff) | |
download | FreeBSD-src-5f92bd8a2360a9a7bab3592599efa577544cf5d7.zip FreeBSD-src-5f92bd8a2360a9a7bab3592599efa577544cf5d7.tar.gz |
Work around Cheetah+ erratum 34 (USIII+ erratum #10) by relocating
the locked entry in it16 slot 0, which typically is occupied by the
PROM, and manually entering locked entries in slots != 0.
Thanks to Hubert Feyrer for donating the Blade 2000 this change was
developed on.
Diffstat (limited to 'sys/boot')
-rw-r--r-- | sys/boot/sparc64/loader/main.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/sys/boot/sparc64/loader/main.c b/sys/boot/sparc64/loader/main.c index 5091caa..355160c 100644 --- a/sys/boot/sparc64/loader/main.c +++ b/sys/boot/sparc64/loader/main.c @@ -6,6 +6,31 @@ * As long as the above copyright statement and this notice remain * unchanged, you can do what ever you want with this file. */ +/*- + * Copyright (c) 2008 Marius Strobl <marius@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 <sys/cdefs.h> __FBSDID("$FreeBSD$"); @@ -65,6 +90,7 @@ static vm_offset_t dtlb_va_to_pa_sun4u(vm_offset_t); static inline u_long itlb_get_data_sun4u(int slot); static void itlb_enter_sun4u(u_long vpn, u_long data); static vm_offset_t itlb_va_to_pa_sun4u(vm_offset_t); +static void itlb_relocate_locked0_sun4u(void); extern vm_offset_t md_load(char *, vm_offset_t *); static int sparc64_autoload(void); static ssize_t sparc64_readin(const int, vm_offset_t, const size_t); @@ -456,9 +482,32 @@ static void itlb_enter_sun4u(u_long vpn, u_long data) { u_long reg; + int i; reg = rdpr(pstate); wrpr(pstate, reg & ~PSTATE_IE, 0); + + if (cpu_impl == CPU_IMPL_ULTRASPARCIIIp) { + /* + * Search an unused slot != 0 and explicitly enter the data + * and tag there in order to avoid Cheetah+ erratum 34. + */ + for (i = 1; i < itlb_slot_max; i++) { + if ((itlb_get_data_sun4u(i) & TD_V) != 0) + continue; + + stxa(AA_IMMU_TAR, ASI_IMMU, + TLB_TAR_VA(vpn) | TLB_TAR_CTX(TLB_CTX_KERNEL)); + stxa(TLB_DAR_SLOT(i), ASI_ITLB_DATA_ACCESS_REG, data); + flush(KERNBASE); + break; + } + wrpr(pstate, reg, 0); + if (i == itlb_slot_max) + panic("%s: could not find an unused slot", __func__); + return; + } + stxa(AA_IMMU_TAR, ASI_IMMU, TLB_TAR_VA(vpn) | TLB_TAR_CTX(TLB_CTX_KERNEL)); stxa(0, ASI_ITLB_DATA_IN_REG, data); @@ -466,6 +515,48 @@ itlb_enter_sun4u(u_long vpn, u_long data) wrpr(pstate, reg, 0); } +static void +itlb_relocate_locked0_sun4u(void) +{ + u_long data, pstate, tag; + int i; + + if (cpu_impl != CPU_IMPL_ULTRASPARCIIIp) + return; + + pstate = rdpr(pstate); + wrpr(pstate, pstate & ~PSTATE_IE, 0); + + data = itlb_get_data_sun4u(0); + if ((data & (TD_V | TD_L)) != (TD_V | TD_L)) { + wrpr(pstate, pstate, 0); + return; + } + + /* Flush the mapping of slot 0. */ + tag = ldxa(TLB_DAR_SLOT(0), ASI_ITLB_TAG_READ_REG); + stxa(TLB_DEMAP_VA(TLB_TAR_VA(tag)) | TLB_DEMAP_PRIMARY | + TLB_DEMAP_PAGE, ASI_IMMU_DEMAP, 0); + flush(0); /* The USIII-family ignores the address. */ + + /* + * Search a replacement slot != 0 and enter the data and tag + * that formerly were in slot 0. + */ + for (i = 1; i < itlb_slot_max; i++) { + if ((itlb_get_data_sun4u(i) & TD_V) != 0) + continue; + + stxa(AA_IMMU_TAR, ASI_IMMU, tag); + stxa(TLB_DAR_SLOT(i), ASI_ITLB_DATA_ACCESS_REG, data); + flush(0); /* The USIII-family ignores the address. */ + break; + } + wrpr(pstate, pstate, 0); + if (i == itlb_slot_max) + panic("%s: could not find a replacement slot", __func__); +} + static int mmu_mapin_sun4u(vm_offset_t va, vm_size_t len) { @@ -603,6 +694,25 @@ tlb_init_sun4u(void) OF_getprop(child, "#itlb-entries", &itlb_slot_max, sizeof(itlb_slot_max)) == -1) panic("%s: can't get TLB slot max.", __func__); + + if (cpu_impl == CPU_IMPL_ULTRASPARCIIIp) { +#ifdef LOADER_DEBUG + printf("pre fixup:\n"); + pmap_print_tlb_sun4u(); +#endif + + /* + * Relocate the locked entry in it16 slot 0 (if existent) + * as part of working around Cheetah+ erratum 34. + */ + itlb_relocate_locked0_sun4u(); + +#ifdef LOADER_DEBUG + printf("post fixup:\n"); + pmap_print_tlb_sun4u(); +#endif + } + dtlb_store = malloc(dtlb_slot_max * sizeof(*dtlb_store)); itlb_store = malloc(itlb_slot_max * sizeof(*itlb_store)); if (dtlb_store == NULL || itlb_store == NULL) |