/* sun4v_ivec.S: Sun4v interrupt vector handling. * * Copyright (C) 2006 <davem@davemloft.net> */ #include <asm/cpudata.h> #include <asm/intr_queue.h> #include <asm/pil.h> .text .align 32 sun4v_cpu_mondo: /* Head offset in %g2, tail offset in %g4. * If they are the same, no work. */ mov INTRQ_CPU_MONDO_HEAD, %g2 ldxa [%g2] ASI_QUEUE, %g2 mov INTRQ_CPU_MONDO_TAIL, %g4 ldxa [%g4] ASI_QUEUE, %g4 cmp %g2, %g4 be,pn %xcc, sun4v_cpu_mondo_queue_empty nop /* Get &trap_block[smp_processor_id()] into %g3. */ ldxa [%g0] ASI_SCRATCHPAD, %g3 sub %g3, TRAP_PER_CPU_FAULT_INFO, %g3 /* Get CPU mondo queue base phys address into %g7. */ ldx [%g3 + TRAP_PER_CPU_CPU_MONDO_PA], %g7 /* Now get the cross-call arguments and handler PC, same * layout as sun4u: * * 1st 64-bit word: low half is 32-bit PC, put into %g3 and jmpl to it * high half is context arg to MMU flushes, into %g5 * 2nd 64-bit word: 64-bit arg, load into %g1 * 3rd 64-bit word: 64-bit arg, load into %g7 */ ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g3 add %g2, 0x8, %g2 srlx %g3, 32, %g5 ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g1 add %g2, 0x8, %g2 srl %g3, 0, %g3 ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g7 add %g2, 0x40 - 0x8 - 0x8, %g2 /* Update queue head pointer. */ sethi %hi(8192 - 1), %g4 or %g4, %lo(8192 - 1), %g4 and %g2, %g4, %g2 mov INTRQ_CPU_MONDO_HEAD, %g4 stxa %g2, [%g4] ASI_QUEUE membar #Sync jmpl %g3, %g0 nop sun4v_cpu_mondo_queue_empty: retry sun4v_dev_mondo: /* Head offset in %g2, tail offset in %g4. */ mov INTRQ_DEVICE_MONDO_HEAD, %g2 ldxa [%g2] ASI_QUEUE, %g2 mov INTRQ_DEVICE_MONDO_TAIL, %g4 ldxa [%g4] ASI_QUEUE, %g4 cmp %g2, %g4 be,pn %xcc, sun4v_dev_mondo_queue_empty nop /* Get &trap_block[smp_processor_id()] into %g3. */ ldxa [%g0] ASI_SCRATCHPAD, %g3 sub %g3, TRAP_PER_CPU_FAULT_INFO, %g3 /* Get DEV mondo queue base phys address into %g5. */ ldx [%g3 + TRAP_PER_CPU_DEV_MONDO_PA], %g5 /* Load IVEC into %g3. */ ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 add %g2, 0x40, %g2 /* XXX There can be a full 64-byte block of data here. * XXX This is how we can get at MSI vector data. * XXX Current we do not capture this, but when we do we'll * XXX need to add a 64-byte storage area in the struct ino_bucket * XXX or the struct irq_desc. */ /* Update queue head pointer, this frees up some registers. */ sethi %hi(8192 - 1), %g4 or %g4, %lo(8192 - 1), %g4 and %g2, %g4, %g2 mov INTRQ_DEVICE_MONDO_HEAD, %g4 stxa %g2, [%g4] ASI_QUEUE membar #Sync /* Get &__irq_work[smp_processor_id()] into %g1. */ TRAP_LOAD_IRQ_WORK(%g1, %g4) /* Get &ivector_table[IVEC] into %g4. */ sethi %hi(ivector_table), %g4 sllx %g3, 3, %g3 or %g4, %lo(ivector_table), %g4 add %g4, %g3, %g4 /* Insert ivector_table[] entry into __irq_work[] queue. */ lduw [%g1], %g2 /* g2 = irq_work(cpu) */ stw %g2, [%g4 + 0x00] /* bucket->irq_chain = g2 */ stw %g4, [%g1] /* irq_work(cpu) = bucket */ /* Signal the interrupt by setting (1 << pil) in %softint. */ wr %g0, 1 << PIL_DEVICE_IRQ, %set_softint sun4v_dev_mondo_queue_empty: retry sun4v_res_mondo: /* Head offset in %g2, tail offset in %g4. */ mov INTRQ_RESUM_MONDO_HEAD, %g2 ldxa [%g2] ASI_QUEUE, %g2 mov INTRQ_RESUM_MONDO_TAIL, %g4 ldxa [%g4] ASI_QUEUE, %g4 cmp %g2, %g4 be,pn %xcc, sun4v_res_mondo_queue_empty nop /* Get &trap_block[smp_processor_id()] into %g3. */ ldxa [%g0] ASI_SCRATCHPAD, %g3 sub %g3, TRAP_PER_CPU_FAULT_INFO, %g3 /* Get RES mondo queue base phys address into %g5. */ ldx [%g3 + TRAP_PER_CPU_RESUM_MONDO_PA], %g5 /* Get RES kernel buffer base phys address into %g7. */ ldx [%g3 + TRAP_PER_CPU_RESUM_KBUF_PA], %g7 /* If the first word is non-zero, queue is full. */ ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g1 brnz,pn %g1, sun4v_res_mondo_queue_full nop /* Remember this entry's offset in %g1. */ mov %g2, %g1 /* Copy 64-byte queue entry into kernel buffer. */ ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 /* Update queue head pointer. */ sethi %hi(8192 - 1), %g4 or %g4, %lo(8192 - 1), %g4 and %g2, %g4, %g2 mov INTRQ_RESUM_MONDO_HEAD, %g4 stxa %g2, [%g4] ASI_QUEUE membar #Sync /* Disable interrupts and save register state so we can call * C code. The etrap handling will leave %g4 in %l4 for us * when it's done. */ rdpr %pil, %g2 wrpr %g0, 15, %pil mov %g1, %g4 ba,pt %xcc, etrap_irq rd %pc, %g7 /* Log the event. */ add %sp, PTREGS_OFF, %o0 call sun4v_resum_error mov %l4, %o1 /* Return from trap. */ ba,pt %xcc, rtrap_irq nop sun4v_res_mondo_queue_empty: retry sun4v_res_mondo_queue_full: /* The queue is full, consolidate our damage by setting * the head equal to the tail. We'll just trap again otherwise. * Call C code to log the event. */ mov INTRQ_RESUM_MONDO_HEAD, %g2 stxa %g4, [%g2] ASI_QUEUE membar #Sync rdpr %pil, %g2 wrpr %g0, 15, %pil ba,pt %xcc, etrap_irq rd %pc, %g7 call sun4v_resum_overflow add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap_irq nop sun4v_nonres_mondo: /* Head offset in %g2, tail offset in %g4. */ mov INTRQ_NONRESUM_MONDO_HEAD, %g2 ldxa [%g2] ASI_QUEUE, %g2 mov INTRQ_NONRESUM_MONDO_TAIL, %g4 ldxa [%g4] ASI_QUEUE, %g4 cmp %g2, %g4 be,pn %xcc, sun4v_nonres_mondo_queue_empty nop /* Get &trap_block[smp_processor_id()] into %g3. */ ldxa [%g0] ASI_SCRATCHPAD, %g3 sub %g3, TRAP_PER_CPU_FAULT_INFO, %g3 /* Get RES mondo queue base phys address into %g5. */ ldx [%g3 + TRAP_PER_CPU_NONRESUM_MONDO_PA], %g5 /* Get RES kernel buffer base phys address into %g7. */ ldx [%g3 + TRAP_PER_CPU_NONRESUM_KBUF_PA], %g7 /* If the first word is non-zero, queue is full. */ ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g1 brnz,pn %g1, sun4v_nonres_mondo_queue_full nop /* Remember this entry's offset in %g1. */ mov %g2, %g1 /* Copy 64-byte queue entry into kernel buffer. */ ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3 stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC add %g2, 0x08, %g2 /* Update queue head pointer. */ sethi %hi(8192 - 1), %g4 or %g4, %lo(8192 - 1), %g4 and %g2, %g4, %g2 mov INTRQ_NONRESUM_MONDO_HEAD, %g4 stxa %g2, [%g4] ASI_QUEUE membar #Sync /* Disable interrupts and save register state so we can call * C code. The etrap handling will leave %g4 in %l4 for us * when it's done. */ rdpr %pil, %g2 wrpr %g0, 15, %pil mov %g1, %g4 ba,pt %xcc, etrap_irq rd %pc, %g7 /* Log the event. */ add %sp, PTREGS_OFF, %o0 call sun4v_nonresum_error mov %l4, %o1 /* Return from trap. */ ba,pt %xcc, rtrap_irq nop sun4v_nonres_mondo_queue_empty: retry sun4v_nonres_mondo_queue_full: /* The queue is full, consolidate our damage by setting * the head equal to the tail. We'll just trap again otherwise. * Call C code to log the event. */ mov INTRQ_NONRESUM_MONDO_HEAD, %g2 stxa %g4, [%g2] ASI_QUEUE membar #Sync rdpr %pil, %g2 wrpr %g0, 15, %pil ba,pt %xcc, etrap_irq rd %pc, %g7 call sun4v_nonresum_overflow add %sp, PTREGS_OFF, %o0 ba,pt %xcc, rtrap_irq nop