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privop.h
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1 #ifndef _ASM_IA64_XEN_PRIVOP_H
2 #define _ASM_IA64_XEN_PRIVOP_H
3 
4 /*
5  * Copyright (C) 2005 Hewlett-Packard Co
6  * Dan Magenheimer <[email protected]>
7  *
8  * Paravirtualizations of privileged operations for Xen/ia64
9  *
10  *
11  * inline privop and paravirt_alt support
12  * Copyright (c) 2007 Isaku Yamahata <yamahata at valinux co jp>
13  * VA Linux Systems Japan K.K.
14  *
15  */
16 
17 #ifndef __ASSEMBLY__
18 #include <linux/types.h> /* arch-ia64.h requires uint64_t */
19 #endif
20 #include <asm/xen/interface.h>
21 
22 /* At 1 MB, before per-cpu space but still addressable using addl instead
23  of movl. */
24 #define XSI_BASE 0xfffffffffff00000
25 
26 /* Address of mapped regs. */
27 #define XMAPPEDREGS_BASE (XSI_BASE + XSI_SIZE)
28 
29 #ifdef __ASSEMBLY__
30 #define XEN_HYPER_RFI break HYPERPRIVOP_RFI
31 #define XEN_HYPER_RSM_PSR_DT break HYPERPRIVOP_RSM_DT
32 #define XEN_HYPER_SSM_PSR_DT break HYPERPRIVOP_SSM_DT
33 #define XEN_HYPER_COVER break HYPERPRIVOP_COVER
34 #define XEN_HYPER_ITC_D break HYPERPRIVOP_ITC_D
35 #define XEN_HYPER_ITC_I break HYPERPRIVOP_ITC_I
36 #define XEN_HYPER_SSM_I break HYPERPRIVOP_SSM_I
37 #define XEN_HYPER_GET_IVR break HYPERPRIVOP_GET_IVR
38 #define XEN_HYPER_THASH break HYPERPRIVOP_THASH
39 #define XEN_HYPER_ITR_D break HYPERPRIVOP_ITR_D
40 #define XEN_HYPER_SET_KR break HYPERPRIVOP_SET_KR
41 #define XEN_HYPER_GET_PSR break HYPERPRIVOP_GET_PSR
42 #define XEN_HYPER_SET_RR0_TO_RR4 break HYPERPRIVOP_SET_RR0_TO_RR4
43 
44 #define XSI_IFS (XSI_BASE + XSI_IFS_OFS)
45 #define XSI_PRECOVER_IFS (XSI_BASE + XSI_PRECOVER_IFS_OFS)
46 #define XSI_IFA (XSI_BASE + XSI_IFA_OFS)
47 #define XSI_ISR (XSI_BASE + XSI_ISR_OFS)
48 #define XSI_IIM (XSI_BASE + XSI_IIM_OFS)
49 #define XSI_ITIR (XSI_BASE + XSI_ITIR_OFS)
50 #define XSI_PSR_I_ADDR (XSI_BASE + XSI_PSR_I_ADDR_OFS)
51 #define XSI_PSR_IC (XSI_BASE + XSI_PSR_IC_OFS)
52 #define XSI_IPSR (XSI_BASE + XSI_IPSR_OFS)
53 #define XSI_IIP (XSI_BASE + XSI_IIP_OFS)
54 #define XSI_B1NAT (XSI_BASE + XSI_B1NATS_OFS)
55 #define XSI_BANK1_R16 (XSI_BASE + XSI_BANK1_R16_OFS)
56 #define XSI_BANKNUM (XSI_BASE + XSI_BANKNUM_OFS)
57 #define XSI_IHA (XSI_BASE + XSI_IHA_OFS)
58 #define XSI_ITC_OFFSET (XSI_BASE + XSI_ITC_OFFSET_OFS)
59 #define XSI_ITC_LAST (XSI_BASE + XSI_ITC_LAST_OFS)
60 #endif
61 
62 #ifndef __ASSEMBLY__
63 
64 /************************************************/
65 /* Instructions paravirtualized for correctness */
66 /************************************************/
67 
68 /* "fc" and "thash" are privilege-sensitive instructions, meaning they
69  * may have different semantics depending on whether they are executed
70  * at PL0 vs PL!=0. When paravirtualized, these instructions mustn't
71  * be allowed to execute directly, lest incorrect semantics result. */
72 extern void xen_fc(void *addr);
73 extern unsigned long xen_thash(unsigned long addr);
74 
75 /* Note that "ttag" and "cover" are also privilege-sensitive; "ttag"
76  * is not currently used (though it may be in a long-format VHPT system!)
77  * and the semantics of cover only change if psr.ic is off which is very
78  * rare (and currently non-existent outside of assembly code */
79 
80 /* There are also privilege-sensitive registers. These registers are
81  * readable at any privilege level but only writable at PL0. */
82 extern unsigned long xen_get_cpuid(int index);
83 extern unsigned long xen_get_pmd(int index);
84 
85 #ifndef ASM_SUPPORTED
86 extern unsigned long xen_get_eflag(void); /* see xen_ia64_getreg */
87 extern void xen_set_eflag(unsigned long); /* see xen_ia64_setreg */
88 #endif
89 
90 /************************************************/
91 /* Instructions paravirtualized for performance */
92 /************************************************/
93 
94 /* Xen uses memory-mapped virtual privileged registers for access to many
95  * performance-sensitive privileged registers. Some, like the processor
96  * status register (psr), are broken up into multiple memory locations.
97  * Others, like "pend", are abstractions based on privileged registers.
98  * "Pend" is guaranteed to be set if reading cr.ivr would return a
99  * (non-spurious) interrupt. */
100 #define XEN_MAPPEDREGS ((struct mapped_regs *)XMAPPEDREGS_BASE)
101 
102 #define XSI_PSR_I \
103  (*XEN_MAPPEDREGS->interrupt_mask_addr)
104 #define xen_get_virtual_psr_i() \
105  (!XSI_PSR_I)
106 #define xen_set_virtual_psr_i(_val) \
107  ({ XSI_PSR_I = (uint8_t)(_val) ? 0 : 1; })
108 #define xen_set_virtual_psr_ic(_val) \
109  ({ XEN_MAPPEDREGS->interrupt_collection_enabled = _val ? 1 : 0; })
110 #define xen_get_virtual_pend() \
111  (*(((uint8_t *)XEN_MAPPEDREGS->interrupt_mask_addr) - 1))
112 
113 #ifndef ASM_SUPPORTED
114 /* Although all privileged operations can be left to trap and will
115  * be properly handled by Xen, some are frequent enough that we use
116  * hyperprivops for performance. */
117 extern unsigned long xen_get_psr(void);
118 extern unsigned long xen_get_ivr(void);
119 extern unsigned long xen_get_tpr(void);
120 extern void xen_hyper_ssm_i(void);
121 extern void xen_set_itm(unsigned long);
122 extern void xen_set_tpr(unsigned long);
123 extern void xen_eoi(unsigned long);
124 extern unsigned long xen_get_rr(unsigned long index);
125 extern void xen_set_rr(unsigned long index, unsigned long val);
126 extern void xen_set_rr0_to_rr4(unsigned long val0, unsigned long val1,
127  unsigned long val2, unsigned long val3,
128  unsigned long val4);
129 extern void xen_set_kr(unsigned long index, unsigned long val);
130 extern void xen_ptcga(unsigned long addr, unsigned long size);
131 #endif /* !ASM_SUPPORTED */
132 
133 #endif /* !__ASSEMBLY__ */
134 
135 #endif /* _ASM_IA64_XEN_PRIVOP_H */