When attempting to load kadb from a Solaris 8 CD at boot, it seems that in order for kadb to allocate enough memory to load the kernel (and its modules) the /openprom/aligned-allocator property must be present with length zero.
This has the additional side-effect that OpenBIOS memory allocations are redirected to a new romvec offset when this property is detected, which appears to have a similar interface to obp_dumb_memalloc() but with an extra alignment parameter. Hence we include a simple implementation which seems to be enough to be able to get kadb to load and attach to the kernel.
--- openbios-devel/arch/sparc32/call-romvec.S | 1 + openbios-devel/arch/sparc32/lib.c | 28 +++++++++++++++++----------- openbios-devel/arch/sparc32/openprom.h | 5 ++++- openbios-devel/arch/sparc32/romvec.c | 2 ++ openbios-devel/arch/sparc32/romvec.h | 2 ++ openbios-devel/arch/sparc32/tree.fs | 3 +++ 6 files changed, 29 insertions(+), 12 deletions(-)
diff --git a/openbios-devel/arch/sparc32/call-romvec.S b/openbios-devel/arch/sparc32/call-romvec.S index 1e8f754..2b2dfe0 100644 --- a/openbios-devel/arch/sparc32/call-romvec.S +++ b/openbios-devel/arch/sparc32/call-romvec.S @@ -89,4 +89,5 @@ ROMVEC_HANDLER(obp_proplen) ROMVEC_HANDLER(obp_getprop) ROMVEC_HANDLER(obp_setprop) ROMVEC_HANDLER(obp_nextprop) +ROMVEC_HANDLER(obp_align_memalloc)
diff --git a/openbios-devel/arch/sparc32/lib.c b/openbios-devel/arch/sparc32/lib.c index 01fa570..b975fd4 100644 --- a/openbios-devel/arch/sparc32/lib.c +++ b/openbios-devel/arch/sparc32/lib.c @@ -347,10 +347,25 @@ void ofmem_arch_early_map_pages(phys_addr_t phys, ucell virt, ucell size, ucell map_pages(phys, virt, size, mode); }
-char *obp_dumb_memalloc(char *va, unsigned int size) +char *obp_align_memalloc(char *va, unsigned int size, unsigned int align) { phys_addr_t phys; ucell virt; + + /* Claim physical memory */ + phys = ofmem_claim_phys(-1, size, align); + + /* Claim virtual memory */ + virt = ofmem_claim_virt(pointer2cell(va), size, 0); + + /* Map the memory */ + ofmem_map(phys, virt, size, ofmem_arch_default_translation_mode(phys)); + + return cell2pointer(virt); +} + +char *obp_dumb_memalloc(char *va, unsigned int size) +{ unsigned long align; int i;
@@ -371,16 +386,7 @@ char *obp_dumb_memalloc(char *va, unsigned int size) align++; }
- /* Claim physical memory */ - phys = ofmem_claim_phys(-1, size, align); - - /* Claim virtual memory */ - virt = ofmem_claim_virt(pointer2cell(va), size, 0); - - /* Map the memory */ - ofmem_map(phys, virt, size, ofmem_arch_default_translation_mode(phys)); - - return cell2pointer(virt); + return obp_align_memalloc(va, size, align); }
void obp_dumb_memfree(__attribute__((unused))char *va, diff --git a/openbios-devel/arch/sparc32/openprom.h b/openbios-devel/arch/sparc32/openprom.h index 0a2074b..5f05014 100644 --- a/openbios-devel/arch/sparc32/openprom.h +++ b/openbios-devel/arch/sparc32/openprom.h @@ -135,7 +135,10 @@ struct linux_romvec { struct linux_bootargs_v2 pv_v2bootargs; struct linux_dev_v2_funcs pv_v2devops;
- int filler[15]; + /* Allocate memory to specified alignment */ + char * (*pv_align_mem_alloc)(char *va, unsigned int size, unsigned int align); + + int filler[11];
/* This one is sun4c/sun4 only. */ void (*pv_setctxt)(int ctxt, char *va, int pmeg); diff --git a/openbios-devel/arch/sparc32/romvec.c b/openbios-devel/arch/sparc32/romvec.c index 843b9f4..463181d 100644 --- a/openbios-devel/arch/sparc32/romvec.c +++ b/openbios-devel/arch/sparc32/romvec.c @@ -508,6 +508,8 @@ init_openprom(void) fword("open-dev"); obp_fd_stdout = POP();
+ romvec0.pv_align_mem_alloc = obp_align_memalloc_handler; + romvec0.v3_cpustart = obp_cpustart_handler; romvec0.v3_cpustop = obp_cpustop_handler; romvec0.v3_cpuidle = obp_cpuidle_handler; diff --git a/openbios-devel/arch/sparc32/romvec.h b/openbios-devel/arch/sparc32/romvec.h index d5103d1..816109c 100644 --- a/openbios-devel/arch/sparc32/romvec.h +++ b/openbios-devel/arch/sparc32/romvec.h @@ -74,3 +74,5 @@ int obp_setprop_handler(__attribute__((unused)) int node, __attribute__((unused)) int len); const char *obp_nextprop(int node, const char *name); const char *obp_nextprop_handler(int node, const char *name); +char *obp_align_memalloc(char *va, unsigned int size, unsigned int align); +char *obp_align_memalloc_handler(char *va, unsigned int size, unsigned int align); diff --git a/openbios-devel/arch/sparc32/tree.fs b/openbios-devel/arch/sparc32/tree.fs index c0b08bd..f9a0406 100644 --- a/openbios-devel/arch/sparc32/tree.fs +++ b/openbios-devel/arch/sparc32/tree.fs @@ -125,3 +125,6 @@ finish-device
" /options" find-device " disk" encode-string " boot-from" property + +" /openprom" find-device + 0 0 " aligned-allocator" property