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| author | Jonas Bonn <jonas@southpole.se> | 2013-02-14 16:16:49 +0100 |
|---|---|---|
| committer | Jonas Bonn <jonas@southpole.se> | 2013-02-14 16:39:26 +0100 |
| commit | a81252d75e14cc2cf0ee45078ef143562a0bc279 (patch) | |
| tree | 7b8bb82ebd471c129788dade8667f4e4fae285dc /arch/openrisc | |
| parent | 7f81ea7e28c3e4e5b762111dc676b24152f85a3a (diff) | |
| download | lwn-a81252d75e14cc2cf0ee45078ef143562a0bc279.tar.gz lwn-a81252d75e14cc2cf0ee45078ef143562a0bc279.zip | |
openrisc: fix up vmalloc page table loading
vmalloc'ed pages are faulted into a process' page tables on demand. In
order to facilitate this, do_page_fault needs to know whether it was
called via a page fault exception or a TLB-miss exception.
This patch adds a wrapper around the _x_page_fault_handler entry points
that the TLB-miss exceptions can call into in order to have the relevant
parameter set to satisfy do_page_fault.
This fixes a bug and is "good enough" for now. That said, this whole
handling of vmalloc needs to be audited for correctness at some point.
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Diffstat (limited to 'arch/openrisc')
| -rw-r--r-- | arch/openrisc/kernel/entry.S | 14 | ||||
| -rw-r--r-- | arch/openrisc/kernel/head.S | 6 |
2 files changed, 14 insertions, 6 deletions
diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index 5e5b30601bbf..3de971224cfc 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S @@ -201,12 +201,17 @@ EXCEPTION_ENTRY(_bus_fault_handler) l.nop /* ---[ 0x300: Data Page Fault exception ]------------------------------- */ +EXCEPTION_ENTRY(_dtlb_miss_page_fault_handler) + l.and r5,r5,r0 + l.j 1f + l.nop EXCEPTION_ENTRY(_data_page_fault_handler) /* set up parameters for do_page_fault */ + l.ori r5,r0,0x300 // exception vector +1: l.addi r3,r1,0 // pt_regs /* r4 set be EXCEPTION_HANDLE */ // effective address of fault - l.ori r5,r0,0x300 // exception vector /* * __PHX__: TODO @@ -276,12 +281,17 @@ EXCEPTION_ENTRY(_data_page_fault_handler) l.nop /* ---[ 0x400: Insn Page Fault exception ]------------------------------- */ +EXCEPTION_ENTRY(_itlb_miss_page_fault_handler) + l.and r5,r5,r0 + l.j 1f + l.nop EXCEPTION_ENTRY(_insn_page_fault_handler) /* set up parameters for do_page_fault */ + l.ori r5,r0,0x400 // exception vector +1: l.addi r3,r1,0 // pt_regs /* r4 set be EXCEPTION_HANDLE */ // effective address of fault - l.ori r5,r0,0x400 // exception vector l.ori r6,r0,0x0 // !write access /* call fault.c handler in or32/mm/fault.c */ diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S index 46aa940ebd20..b357e7f79aca 100644 --- a/arch/openrisc/kernel/head.S +++ b/arch/openrisc/kernel/head.S @@ -1069,8 +1069,7 @@ d_pte_not_present: EXCEPTION_LOAD_GPR4 EXCEPTION_LOAD_GPR5 EXCEPTION_LOAD_GPR6 - l.j _dispatch_do_dpage_fault - l.nop + EXCEPTION_HANDLE(_dtlb_miss_page_fault_handler) /* ==============================================[ ITLB miss handler ]=== */ ENTRY(itlb_miss_handler) @@ -1192,8 +1191,7 @@ i_pte_not_present: EXCEPTION_LOAD_GPR4 EXCEPTION_LOAD_GPR5 EXCEPTION_LOAD_GPR6 - l.j _dispatch_do_ipage_fault - l.nop + EXCEPTION_HANDLE(_itlb_miss_page_fault_handler) /* ==============================================[ boot tlb handlers ]=== */ |