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qemu/hw/spapr_hcall.c
David Gibson 821303f59b Implement assorted pSeries hcalls and RTAS methods 
This patch adds several small utility hypercalls and RTAS methods to
the pSeries platform emulation.  Specifically:

* 'display-character' rtas call

This just prints a character to the console, it's occasionally used
for early debug of the OS.  The support includes a hack to make this
RTAS call respond on the normal token value present on real hardware,
since some early debugging tools just assume this value without
checking the device tree.

* 'get-time-of-day' rtas call

This one just takes the host real time, converts to the PAPR described
format and returns it to the guest.

* 'power-off' rtas call

This one shuts down the emulated system.

* H_DABR hypercall

On pSeries, the DABR debug register is usually a hypervisor resource
and virtualized through this hypercall.  If the hypercall is not
present, Linux will under some circumstances attempt to manipulate the
DABR directly which will fail on this emulated machine.

This stub implementation is enough to stop that behaviour, although it
doesn't actually implement the requested DABR operations as yet.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2011-04-01 18:34:56 +02:00

334 lines
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#include "sysemu.h"
#include "cpu.h"
#include "qemu-char.h"
#include "sysemu.h"
#include "qemu-char.h"
#include "exec-all.h"
#include "hw/spapr.h"
#define HPTES_PER_GROUP 8
#define HPTE_V_SSIZE_SHIFT 62
#define HPTE_V_AVPN_SHIFT 7
#define HPTE_V_AVPN 0x3fffffffffffff80ULL
#define HPTE_V_AVPN_VAL(x) (((x) & HPTE_V_AVPN) >> HPTE_V_AVPN_SHIFT)
#define HPTE_V_COMPARE(x, y) (!(((x) ^ (y)) & 0xffffffffffffff80UL))
#define HPTE_V_BOLTED 0x0000000000000010ULL
#define HPTE_V_LOCK 0x0000000000000008ULL
#define HPTE_V_LARGE 0x0000000000000004ULL
#define HPTE_V_SECONDARY 0x0000000000000002ULL
#define HPTE_V_VALID 0x0000000000000001ULL
#define HPTE_R_PP0 0x8000000000000000ULL
#define HPTE_R_TS 0x4000000000000000ULL
#define HPTE_R_KEY_HI 0x3000000000000000ULL
#define HPTE_R_RPN_SHIFT 12
#define HPTE_R_RPN 0x3ffffffffffff000ULL
#define HPTE_R_FLAGS 0x00000000000003ffULL
#define HPTE_R_PP 0x0000000000000003ULL
#define HPTE_R_N 0x0000000000000004ULL
#define HPTE_R_G 0x0000000000000008ULL
#define HPTE_R_M 0x0000000000000010ULL
#define HPTE_R_I 0x0000000000000020ULL
#define HPTE_R_W 0x0000000000000040ULL
#define HPTE_R_WIMG 0x0000000000000078ULL
#define HPTE_R_C 0x0000000000000080ULL
#define HPTE_R_R 0x0000000000000100ULL
#define HPTE_R_KEY_LO 0x0000000000000e00ULL
#define HPTE_V_1TB_SEG 0x4000000000000000ULL
#define HPTE_V_VRMA_MASK 0x4001ffffff000000ULL
#define HPTE_V_HVLOCK 0x40ULL
static inline int lock_hpte(void *hpte, target_ulong bits)
{
uint64_t pteh;
pteh = ldq_p(hpte);
/* We're protected by qemu's global lock here */
if (pteh & bits) {
return 0;
}
stq_p(hpte, pteh | HPTE_V_HVLOCK);
return 1;
}
static target_ulong compute_tlbie_rb(target_ulong v, target_ulong r,
target_ulong pte_index)
{
target_ulong rb, va_low;
rb = (v & ~0x7fULL) << 16; /* AVA field */
va_low = pte_index >> 3;
if (v & HPTE_V_SECONDARY) {
va_low = ~va_low;
}
/* xor vsid from AVA */
if (!(v & HPTE_V_1TB_SEG)) {
va_low ^= v >> 12;
} else {
va_low ^= v >> 24;
}
va_low &= 0x7ff;
if (v & HPTE_V_LARGE) {
rb |= 1; /* L field */
#if 0 /* Disable that P7 specific bit for now */
if (r & 0xff000) {
/* non-16MB large page, must be 64k */
/* (masks depend on page size) */
rb |= 0x1000; /* page encoding in LP field */
rb |= (va_low & 0x7f) << 16; /* 7b of VA in AVA/LP field */
rb |= (va_low & 0xfe); /* AVAL field */
}
#endif
} else {
/* 4kB page */
rb |= (va_low & 0x7ff) << 12; /* remaining 11b of AVA */
}
rb |= (v >> 54) & 0x300; /* B field */
return rb;
}
static target_ulong h_enter(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong flags = args[0];
target_ulong pte_index = args[1];
target_ulong pteh = args[2];
target_ulong ptel = args[3];
target_ulong porder;
target_ulong i, pa;
uint8_t *hpte;
/* only handle 4k and 16M pages for now */
porder = 12;
if (pteh & HPTE_V_LARGE) {
#if 0 /* We don't support 64k pages yet */
if ((ptel & 0xf000) == 0x1000) {
/* 64k page */
porder = 16;
} else
#endif
if ((ptel & 0xff000) == 0) {
/* 16M page */
porder = 24;
/* lowest AVA bit must be 0 for 16M pages */
if (pteh & 0x80) {
return H_PARAMETER;
}
} else {
return H_PARAMETER;
}
}
pa = ptel & HPTE_R_RPN;
/* FIXME: bounds check the pa? */
/* Check WIMG */
if ((ptel & HPTE_R_WIMG) != HPTE_R_M) {
return H_PARAMETER;
}
pteh &= ~0x60ULL;
if ((pte_index * HASH_PTE_SIZE_64) & ~env->htab_mask) {
return H_PARAMETER;
}
if (likely((flags & H_EXACT) == 0)) {
pte_index &= ~7ULL;
hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);
for (i = 0; ; ++i) {
if (i == 8) {
return H_PTEG_FULL;
}
if (((ldq_p(hpte) & HPTE_V_VALID) == 0) &&
lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) {
break;
}
hpte += HASH_PTE_SIZE_64;
}
} else {
i = 0;
hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);
if (!lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) {
return H_PTEG_FULL;
}
}
stq_p(hpte + (HASH_PTE_SIZE_64/2), ptel);
/* eieio(); FIXME: need some sort of barrier for smp? */
stq_p(hpte, pteh);
assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));
args[0] = pte_index + i;
return H_SUCCESS;
}
static target_ulong h_remove(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong flags = args[0];
target_ulong pte_index = args[1];
target_ulong avpn = args[2];
uint8_t *hpte;
target_ulong v, r, rb;
if ((pte_index * HASH_PTE_SIZE_64) & ~env->htab_mask) {
return H_PARAMETER;
}
hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);
while (!lock_hpte(hpte, HPTE_V_HVLOCK)) {
/* We have no real concurrency in qemu soft-emulation, so we
* will never actually have a contested lock */
assert(0);
}
v = ldq_p(hpte);
r = ldq_p(hpte + (HASH_PTE_SIZE_64/2));
if ((v & HPTE_V_VALID) == 0 ||
((flags & H_AVPN) && (v & ~0x7fULL) != avpn) ||
((flags & H_ANDCOND) && (v & avpn) != 0)) {
stq_p(hpte, v & ~HPTE_V_HVLOCK);
assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));
return H_NOT_FOUND;
}
args[0] = v & ~HPTE_V_HVLOCK;
args[1] = r;
stq_p(hpte, 0);
rb = compute_tlbie_rb(v, r, pte_index);
ppc_tlb_invalidate_one(env, rb);
assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));
return H_SUCCESS;
}
static target_ulong h_protect(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong flags = args[0];
target_ulong pte_index = args[1];
target_ulong avpn = args[2];
uint8_t *hpte;
target_ulong v, r, rb;
if ((pte_index * HASH_PTE_SIZE_64) & ~env->htab_mask) {
return H_PARAMETER;
}
hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);
while (!lock_hpte(hpte, HPTE_V_HVLOCK)) {
/* We have no real concurrency in qemu soft-emulation, so we
* will never actually have a contested lock */
assert(0);
}
v = ldq_p(hpte);
r = ldq_p(hpte + (HASH_PTE_SIZE_64/2));
if ((v & HPTE_V_VALID) == 0 ||
((flags & H_AVPN) && (v & ~0x7fULL) != avpn)) {
stq_p(hpte, v & ~HPTE_V_HVLOCK);
assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));
return H_NOT_FOUND;
}
r &= ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |
HPTE_R_KEY_HI | HPTE_R_KEY_LO);
r |= (flags << 55) & HPTE_R_PP0;
r |= (flags << 48) & HPTE_R_KEY_HI;
r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
rb = compute_tlbie_rb(v, r, pte_index);
stq_p(hpte, v & ~HPTE_V_VALID);
ppc_tlb_invalidate_one(env, rb);
stq_p(hpte + (HASH_PTE_SIZE_64/2), r);
/* Don't need a memory barrier, due to qemu's global lock */
stq_p(hpte, v & ~HPTE_V_HVLOCK);
assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));
return H_SUCCESS;
}
static target_ulong h_set_dabr(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
/* FIXME: actually implement this */
return H_HARDWARE;
}
static target_ulong h_rtas(CPUState *env, sPAPREnvironment *spapr,
target_ulong opcode, target_ulong *args)
{
target_ulong rtas_r3 = args[0];
uint32_t token = ldl_phys(rtas_r3);
uint32_t nargs = ldl_phys(rtas_r3 + 4);
uint32_t nret = ldl_phys(rtas_r3 + 8);
return spapr_rtas_call(spapr, token, nargs, rtas_r3 + 12,
nret, rtas_r3 + 12 + 4*nargs);
}
spapr_hcall_fn papr_hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
spapr_hcall_fn kvmppc_hypercall_table[KVMPPC_HCALL_MAX - KVMPPC_HCALL_BASE];
void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn)
{
spapr_hcall_fn *slot;
if (opcode <= MAX_HCALL_OPCODE) {
assert((opcode & 0x3) == 0);
slot = &papr_hypercall_table[opcode / 4];
} else {
assert((opcode >= KVMPPC_HCALL_BASE) && (opcode <= KVMPPC_HCALL_MAX));
slot = &kvmppc_hypercall_table[opcode - KVMPPC_HCALL_BASE];
}
assert(!(*slot) || (fn == *slot));
*slot = fn;
}
target_ulong spapr_hypercall(CPUState *env, target_ulong opcode,
target_ulong *args)
{
if (msr_pr) {
hcall_dprintf("Hypercall made with MSR[PR]=1\n");
return H_PRIVILEGE;
}
if ((opcode <= MAX_HCALL_OPCODE)
&& ((opcode & 0x3) == 0)) {
spapr_hcall_fn fn = papr_hypercall_table[opcode / 4];
if (fn) {
return fn(env, spapr, opcode, args);
}
} else if ((opcode >= KVMPPC_HCALL_BASE) &&
(opcode <= KVMPPC_HCALL_MAX)) {
spapr_hcall_fn fn = kvmppc_hypercall_table[opcode - KVMPPC_HCALL_BASE];
if (fn) {
return fn(env, spapr, opcode, args);
}
}
hcall_dprintf("Unimplemented hcall 0x" TARGET_FMT_lx "\n", opcode);
return H_FUNCTION;
}
static void hypercall_init(void)
{
/* hcall-pft */
spapr_register_hypercall(H_ENTER, h_enter);
spapr_register_hypercall(H_REMOVE, h_remove);
spapr_register_hypercall(H_PROTECT, h_protect);
/* hcall-dabr */
spapr_register_hypercall(H_SET_DABR, h_set_dabr);
/* qemu/KVM-PPC specific hcalls */
spapr_register_hypercall(KVMPPC_H_RTAS, h_rtas);
}
device_init(hypercall_init);
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