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| author | Vineet Gupta <vgupta@synopsys.com> | 2013-05-13 18:30:41 +0530 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-06-22 14:06:55 +0530 |
| commit | 1f6ccfff6314672743ad7252160654709e997a2a (patch) | |
| tree | f2027c01b8d010b9d1aaa3685c7c4d0644271f53 /arch/arc/kernel/process.c | |
| parent | 820970a5aa3c98be26e1df64da4b93294d20d4e7 (diff) | |
| download | linux-1f6ccfff6314672743ad7252160654709e997a2a.tar.gz linux-1f6ccfff6314672743ad7252160654709e997a2a.tar.bz2 linux-1f6ccfff6314672743ad7252160654709e997a2a.zip | |
ARCv2: Support for ARCv2 ISA and HS38x cores
The notable features are:
- SMP configurations of upto 4 cores with coherency
- Optional L2 Cache and IO-Coherency
- Revised Interrupt Architecture (multiple priorites, reg banks,
auto stack switch, auto regfile save/restore)
- MMUv4 (PIPT dcache, Huge Pages)
- Instructions for
* 64bit load/store: LDD, STD
* Hardware assisted divide/remainder: DIV, REM
* Function prologue/epilogue: ENTER_S, LEAVE_S
* IRQ enable/disable: CLRI, SETI
* pop count: FFS, FLS
* SETcc, BMSKN, XBFU...
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/kernel/process.c')
| -rw-r--r-- | arch/arc/kernel/process.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c index b5426babd3c8..51560435a26b 100644 --- a/arch/arc/kernel/process.c +++ b/arch/arc/kernel/process.c @@ -44,7 +44,17 @@ SYSCALL_DEFINE0(arc_gettls) void arch_cpu_idle(void) { /* sleep, but enable all interrupts before committing */ - __asm__("sleep 0x3"); + if (is_isa_arcompact()) { + __asm__("sleep 0x3"); + } else { + /* default irq priority (<=) which can interrupt the doze */ + const int arg = 0x10 | ARCV2_IRQ_DEF_PRIO; + + __asm__ __volatile__( + "sleep %0 \n" + : + :"r"(arg)); + } } asmlinkage void ret_from_fork(void); @@ -166,7 +176,7 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long usp) * [L] ZOL loop inhibited to begin with - cleared by a LP insn * Interrupts enabled */ - regs->status32 = STATUS_U_MASK | STATUS_L_MASK | STATUS_IE_MASK; + regs->status32 = STATUS_U_MASK | STATUS_L_MASK | ISA_INIT_STATUS_BITS; /* bogus seed values for debugging */ regs->lp_start = 0x10; @@ -196,8 +206,11 @@ int elf_check_arch(const struct elf32_hdr *x) { unsigned int eflags; - if (x->e_machine != EM_ARCOMPACT) + if (x->e_machine != EM_ARC_INUSE) { + pr_err("ELF not built for %s ISA\n", + is_isa_arcompact() ? "ARCompact":"ARCv2"); return 0; + } eflags = x->e_flags; if ((eflags & EF_ARC_OSABI_MSK) < EF_ARC_OSABI_CURRENT) { |