/* cpudata.h: Per-cpu parameters.
*
- * Copyright (C) 2003, 2005 David S. Miller (davem@redhat.com)
+ * Copyright (C) 2003, 2005, 2006 David S. Miller (davem@davemloft.net)
*/
#ifndef _SPARC64_CPUDATA_H
#define _SPARC64_CPUDATA_H
+#ifndef __ASSEMBLY__
+
#include <linux/percpu.h>
+#include <linux/threads.h>
typedef struct {
/* Dcache line 1 */
#define cpu_data(__cpu) per_cpu(__cpu_data, (__cpu))
#define local_cpu_data() __get_cpu_var(__cpu_data)
+/* Trap handling code needs to get at a few critical values upon
+ * trap entry and to process TSB misses. These cannot be in the
+ * per_cpu() area as we really need to lock them into the TLB and
+ * thus make them part of the main kernel image. As a result we
+ * try to make this as small as possible.
+ *
+ * This is padded out and aligned to 64-bytes to avoid false sharing
+ * on SMP.
+ */
+
+/* If you modify the size of this structure, please update
+ * TRAP_BLOCK_SZ_SHIFT below.
+ */
+struct thread_info;
+struct trap_per_cpu {
+/* D-cache line 1 */
+ struct thread_info *thread;
+ unsigned long pgd_paddr;
+ unsigned long __pad1[2];
+
+/* D-cache line 2 */
+ unsigned long __pad2[4];
+} __attribute__((aligned(64)));
+extern struct trap_per_cpu trap_block[NR_CPUS];
+extern void init_cur_cpu_trap(void);
+extern void setup_tba(void);
+
+#ifdef CONFIG_SMP
+struct cpuid_patch_entry {
+ unsigned int addr;
+ unsigned int cheetah_safari[4];
+ unsigned int cheetah_jbus[4];
+ unsigned int starfire[4];
+ unsigned int sun4v[4];
+};
+extern struct cpuid_patch_entry __cpuid_patch, __cpuid_patch_end;
+#endif
+
+#endif /* !(__ASSEMBLY__) */
+
+#define TRAP_PER_CPU_THREAD 0x00
+#define TRAP_PER_CPU_PGD_PADDR 0x08
+
+#define TRAP_BLOCK_SZ_SHIFT 6
+
+#include <asm/scratchpad.h>
+
+#ifdef CONFIG_SMP
+
+#define __GET_CPUID(REG) \
+ /* Spitfire implementation (default). */ \
+661: ldxa [%g0] ASI_UPA_CONFIG, REG; \
+ srlx REG, 17, REG; \
+ and REG, 0x1f, REG; \
+ nop; \
+ .section .cpuid_patch, "ax"; \
+ /* Instruction location. */ \
+ .word 661b; \
+ /* Cheetah Safari implementation. */ \
+ ldxa [%g0] ASI_SAFARI_CONFIG, REG; \
+ srlx REG, 17, REG; \
+ and REG, 0x3ff, REG; \
+ nop; \
+ /* Cheetah JBUS implementation. */ \
+ ldxa [%g0] ASI_JBUS_CONFIG, REG; \
+ srlx REG, 17, REG; \
+ and REG, 0x1f, REG; \
+ nop; \
+ /* Starfire implementation. */ \
+ sethi %hi(0x1fff40000d0 >> 9), REG; \
+ sllx REG, 9, REG; \
+ or REG, 0xd0, REG; \
+ lduwa [REG] ASI_PHYS_BYPASS_EC_E, REG;\
+ /* sun4v implementation. */ \
+ mov SCRATCHPAD_CPUID, REG; \
+ nop; \
+ ldxa [REG] ASI_SCRATCHPAD, REG; \
+ nop; \
+ .previous;
+
+/* Clobbers TMP, current address space PGD phys address into DEST. */
+#define TRAP_LOAD_PGD_PHYS(DEST, TMP) \
+ __GET_CPUID(TMP) \
+ sethi %hi(trap_block), DEST; \
+ sllx TMP, TRAP_BLOCK_SZ_SHIFT, TMP; \
+ or DEST, %lo(trap_block), DEST; \
+ add DEST, TMP, DEST; \
+ ldx [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
+
+/* Clobbers TMP, loads local processor's IRQ work area into DEST. */
+#define TRAP_LOAD_IRQ_WORK(DEST, TMP) \
+ __GET_CPUID(TMP) \
+ sethi %hi(__irq_work), DEST; \
+ sllx TMP, 6, TMP; \
+ or DEST, %lo(__irq_work), DEST; \
+ add DEST, TMP, DEST;
+
+/* Clobbers TMP, loads DEST with current thread info pointer. */
+#define TRAP_LOAD_THREAD_REG(DEST, TMP) \
+ __GET_CPUID(TMP) \
+ sethi %hi(trap_block), DEST; \
+ sllx TMP, TRAP_BLOCK_SZ_SHIFT, TMP; \
+ or DEST, %lo(trap_block), DEST; \
+ ldx [DEST + TMP], DEST;
+
+/* Given the current thread info pointer in THR, load the per-cpu
+ * area base of the current processor into DEST. REG1, REG2, and REG3 are
+ * clobbered.
+ *
+ * You absolutely cannot use DEST as a temporary in this code. The
+ * reason is that traps can happen during execution, and return from
+ * trap will load the fully resolved DEST per-cpu base. This can corrupt
+ * the calculations done by the macro mid-stream.
+ */
+#define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3) \
+ ldub [THR + TI_CPU], REG1; \
+ sethi %hi(__per_cpu_shift), REG3; \
+ sethi %hi(__per_cpu_base), REG2; \
+ ldx [REG3 + %lo(__per_cpu_shift)], REG3; \
+ ldx [REG2 + %lo(__per_cpu_base)], REG2; \
+ sllx REG1, REG3, REG3; \
+ add REG3, REG2, DEST;
+
+#else
+
+/* Uniprocessor versions, we know the cpuid is zero. */
+#define TRAP_LOAD_PGD_PHYS(DEST, TMP) \
+ sethi %hi(trap_block), DEST; \
+ or DEST, %lo(trap_block), DEST; \
+ ldx [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
+
+#define TRAP_LOAD_IRQ_WORK(DEST, TMP) \
+ sethi %hi(__irq_work), DEST; \
+ or DEST, %lo(__irq_work), DEST;
+
+#define TRAP_LOAD_THREAD_REG(DEST, TMP) \
+ sethi %hi(trap_block), DEST; \
+ ldx [DEST + %lo(trap_block)], DEST;
+
+/* No per-cpu areas on uniprocessor, so no need to load DEST. */
+#define LOAD_PER_CPU_BASE(DEST, THR, REG1, REG2, REG3)
+
+#endif /* !(CONFIG_SMP) */
+
#endif /* _SPARC64_CPUDATA_H */
projects / firefly-linux-kernel-4.4.55.git / blobdiff