diff options
Diffstat (limited to 'include/asm-ia64/sn/pda.h')
| -rw-r--r-- | include/asm-ia64/sn/pda.h | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/include/asm-ia64/sn/pda.h b/include/asm-ia64/sn/pda.h new file mode 100644 index 000000000000..e940d3647c80 --- /dev/null +++ b/include/asm-ia64/sn/pda.h @@ -0,0 +1,80 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1992 - 1997, 2000-2004 Silicon Graphics, Inc. All rights reserved. + */ +#ifndef _ASM_IA64_SN_PDA_H +#define _ASM_IA64_SN_PDA_H + +#include <linux/cache.h> +#include <asm/percpu.h> +#include <asm/system.h> +#include <asm/sn/bte.h> + + +/* + * CPU-specific data structure. + * + * One of these structures is allocated for each cpu of a NUMA system. + * + * This structure provides a convenient way of keeping together + * all SN per-cpu data structures. + */ + +typedef struct pda_s { + + /* Having a pointer in the begining of PDA tends to increase + * the chance of having this pointer in cache. (Yes something + * else gets pushed out). Doing this reduces the number of memory + * access to all nodepda variables to be one + */ + struct nodepda_s *p_nodepda; /* Pointer to Per node PDA */ + struct subnodepda_s *p_subnodepda; /* Pointer to CPU subnode PDA */ + + /* + * Support for SN LEDs + */ + volatile short *led_address; + u8 led_state; + u8 hb_state; /* supports blinking heartbeat leds */ + unsigned int hb_count; + + unsigned int idle_flag; + + volatile unsigned long *bedrock_rev_id; + volatile unsigned long *pio_write_status_addr; + unsigned long pio_write_status_val; + volatile unsigned long *pio_shub_war_cam_addr; + + unsigned long sn_soft_irr[4]; + unsigned long sn_in_service_ivecs[4]; + short cnodeid_to_nasid_table[MAX_NUMNODES]; + int sn_lb_int_war_ticks; + int sn_last_irq; + int sn_first_irq; +} pda_t; + + +#define CACHE_ALIGN(x) (((x) + SMP_CACHE_BYTES-1) & ~(SMP_CACHE_BYTES-1)) + +/* + * PDA + * Per-cpu private data area for each cpu. The PDA is located immediately after + * the IA64 cpu_data area. A full page is allocated for the cp_data area for each + * cpu but only a small amout of the page is actually used. We put the SNIA PDA + * in the same page as the cpu_data area. Note that there is a check in the setup + * code to verify that we don't overflow the page. + * + * Seems like we should should cache-line align the pda so that any changes in the + * size of the cpu_data area don't change cache layout. Should we align to 32, 64, 128 + * or 512 boundary. Each has merits. For now, pick 128 but should be revisited later. + */ +DECLARE_PER_CPU(struct pda_s, pda_percpu); + +#define pda (&__ia64_per_cpu_var(pda_percpu)) + +#define pdacpu(cpu) (&per_cpu(pda_percpu, cpu)) + +#endif /* _ASM_IA64_SN_PDA_H */ |