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| author | Chris Metcalf <cmetcalf@tilera.com> | 2010-10-14 16:23:03 -0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2010-10-15 15:38:09 -0400 |
| commit | a78c942df64ef4cf495fd4d8715e48501bd7f8a4 (patch) | |
| tree | fe44212d36e6ca23dbe9f2c633824389216a3d1d /arch/tile/kernel/process.c | |
| parent | bf65e440e8248f22b2eacf8d47961bb9d52260f7 (diff) | |
| download | linux-a78c942df64ef4cf495fd4d8715e48501bd7f8a4.tar.bz2 | |
arch/tile: parameterize system PLs to support KVM port
While not a port to KVM (yet), this change modifies the kernel
to be able to build either at PL1 or at PL2 with a suitable
config switch. Pushing up this change avoids handling branch
merge issues going forward with the KVM work.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/kernel/process.c')
| -rw-r--r-- | arch/tile/kernel/process.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/tile/kernel/process.c b/arch/tile/kernel/process.c index 221f12bd27fa..8430f45daea6 100644 --- a/arch/tile/kernel/process.c +++ b/arch/tile/kernel/process.c @@ -305,15 +305,25 @@ int dump_task_regs(struct task_struct *tsk, elf_gregset_t *regs) /* Allow user processes to access the DMA SPRs */ void grant_dma_mpls(void) { +#if CONFIG_KERNEL_PL == 2 + __insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1); + __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1); +#else __insn_mtspr(SPR_MPL_DMA_CPL_SET_0, 1); __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_0, 1); +#endif } /* Forbid user processes from accessing the DMA SPRs */ void restrict_dma_mpls(void) { +#if CONFIG_KERNEL_PL == 2 + __insn_mtspr(SPR_MPL_DMA_CPL_SET_2, 1); + __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_2, 1); +#else __insn_mtspr(SPR_MPL_DMA_CPL_SET_1, 1); __insn_mtspr(SPR_MPL_DMA_NOTIFY_SET_1, 1); +#endif } /* Pause the DMA engine, then save off its state registers. */ @@ -524,7 +534,7 @@ struct task_struct *__sched _switch_to(struct task_struct *prev, * Switch kernel SP, PC, and callee-saved registers. * In the context of the new task, return the old task pointer * (i.e. the task that actually called __switch_to). - * Pass the value to use for SYSTEM_SAVE_1_0 when we reset our sp. + * Pass the value to use for SYSTEM_SAVE_K_0 when we reset our sp. */ return __switch_to(prev, next, next_current_ksp0(next)); } |