Diff 59016

vm_map_protect.9

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#define is_kernel_pmap(x) ((x) == kernel_pmap)		#define is_kernel_pmap(x) ((x) == kernel_pmap)

struct pmap kernel_pmap_store;		struct pmap kernel_pmap_store;
pd_entry_t *kernel_segmap;		pd_entry_t *kernel_segmap;

vm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */		vm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */
vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */		vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */

		static int need_local_mappings;

static int nkpt;		static int nkpt;
unsigned pmap_max_asid; /* max ASID supported by the system */		unsigned pmap_max_asid; /* max ASID supported by the system */

#define PMAP_ASID_RESERVED 0		#define PMAP_ASID_RESERVED 0

vm_offset_t kernel_vm_end = VM_MIN_KERNEL_ADDRESS;		vm_offset_t kernel_vm_end = VM_MIN_KERNEL_ADDRESS;

static void pmap_asid_alloc(pmap_t pmap);		static void pmap_asid_alloc(pmap_t pmap);
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static int pmap_unuse_pt(pmap_t, vm_offset_t, pd_entry_t);		static int pmap_unuse_pt(pmap_t, vm_offset_t, pd_entry_t);
static pt_entry_t init_pte_prot(vm_page_t m, vm_prot_t access, vm_prot_t prot);		static pt_entry_t init_pte_prot(vm_page_t m, vm_prot_t access, vm_prot_t prot);

static void pmap_invalidate_page_action(void *arg);		static void pmap_invalidate_page_action(void *arg);
static void pmap_invalidate_range_action(void *arg);		static void pmap_invalidate_range_action(void *arg);
static void pmap_update_page_action(void *arg);		static void pmap_update_page_action(void *arg);

#ifndef __mips_n64		#ifndef __mips_n64

		static vm_offset_t crashdumpva;

/*		/*
* This structure is for high memory (memory above 512Meg in 32 bit) support.		* These functions are for high memory (memory above 512Meg in 32 bit) support.
* The highmem area does not have a KSEG0 mapping, and we need a mechanism to		* The highmem area does not have a KSEG0 mapping, and we need a mechanism to
* do temporary per-CPU mappings for pmap_zero_page, pmap_copy_page etc.		* do temporary per-CPU mappings for pmap_zero_page, pmap_copy_page etc.
*		*
* At bootup, we reserve 2 virtual pages per CPU for mapping highmem pages. To		* At bootup, we reserve 2 virtual pages per CPU for mapping highmem pages. To
* access a highmem physical address on a CPU, we map the physical address to		* access a highmem physical address on a CPU, we map the physical address to
* the reserved virtual address for the CPU in the kernel pagetable. This is		* the reserved virtual address for the CPU in the kernel pagetable.
* done with interrupts disabled(although a spinlock and sched_pin would be
* sufficient).
*/		*/
struct local_sysmaps {
vm_offset_t base;
uint32_t saved_intr;
uint16_t valid1, valid2;
};
static struct local_sysmaps sysmap_lmem[MAXCPU];

static __inline void		static void
pmap_alloc_lmem_map(void)		pmap_init_reserved_pages(void)
		jahAuthorUnsubmitted Done Inline Actions If mips32 + SMP ends up not being a thing anymore due to the recent 64-bit atomic debate, this function can just be removed. Otherwise, is there a good way for me to exercise that config? I'm open to buying real HW... jah: If mips32 + SMP ends up not being a thing anymore due to the recent 64-bit atomic debate, this…
{		{
		struct pcpu *pc;
		vm_offset_t pages;
int i;		int i;

for (i = 0; i < MAXCPU; i++) {		if (need_local_mappings == 0)
sysmap_lmem[i].base = virtual_avail;		return;
virtual_avail += PAGE_SIZE * 2;
sysmap_lmem[i].valid1 = sysmap_lmem[i].valid2 = 0;		CPU_FOREACH(i) {
		pc = pcpu_find(i);
		/*
		* Skip if the mapping has already been initialized,
		* i.e. this is the BSP.
		*/
		if (pc->pc_cmap1_addr != 0)
		continue;
		pages = kva_alloc(PAGE_SIZE * 3);
		if (pages == 0)
		panic("%s: unable to allocate KVA", __func__);
		pc->pc_cmap1_ptep = pmap_pte(kernel_pmap, pages);
		pc->pc_cmap2_ptep = pmap_pte(kernel_pmap, pages + PAGE_SIZE);
		pc->pc_qmap_ptep =
		pmap_pte(kernel_pmap, pages + (PAGE_SIZE * 2));
		pc->pc_cmap1_addr = pages;
		pc->pc_cmap2_addr = pages + PAGE_SIZE;
		pc->pc_qmap_addr = pages + (PAGE_SIZE * 2);
}		}
}		}
		SYSINIT(rpages_init, SI_SUB_CPU, SI_ORDER_ANY, pmap_init_reserved_pages, NULL);

		static __inline void
		pmap_alloc_lmem_map(void)
		{
		PCPU_SET(cmap1_addr, virtual_avail);
		PCPU_SET(cmap2_addr, virtual_avail + PAGE_SIZE);
		PCPU_SET(cmap1_ptep, pmap_pte(kernel_pmap, virtual_avail));
		PCPU_SET(cmap2_ptep, pmap_pte(kernel_pmap, virtual_avail + PAGE_SIZE));
		PCPU_SET(qmap_addr, virtual_avail + (2 * PAGE_SIZE));
		PCPU_SET(qmap_ptep, pmap_pte(kernel_pmap, virtual_avail + (2 * PAGE_SIZE)));
		crashdumpva = virtual_avail + (3 * PAGE_SIZE);
		virtual_avail += PAGE_SIZE * 4;
		}

static __inline vm_offset_t		static __inline vm_offset_t
pmap_lmem_map1(vm_paddr_t phys)		pmap_lmem_map1(vm_paddr_t phys)
{		{
struct local_sysmaps *sysm;		critical_enter();
pt_entry_t *pte, npte;		*PCPU_GET(cmap1_ptep) =
vm_offset_t va;		TLBLO_PA_TO_PFN(phys) \| PTE_C_CACHE \| PTE_D \| PTE_V \| PTE_G;
uint32_t intr;		return (PCPU_GET(cmap1_addr));
int cpu;

intr = intr_disable();
cpu = PCPU_GET(cpuid);
sysm = &sysmap_lmem[cpu];
sysm->saved_intr = intr;
va = sysm->base;
npte = TLBLO_PA_TO_PFN(phys) \| PTE_C_CACHE \| PTE_D \| PTE_V \| PTE_G;
pte = pmap_pte(kernel_pmap, va);
*pte = npte;
sysm->valid1 = 1;
return (va);
}		}

static __inline vm_offset_t		static __inline vm_offset_t
pmap_lmem_map2(vm_paddr_t phys1, vm_paddr_t phys2)		pmap_lmem_map2(vm_paddr_t phys1, vm_paddr_t phys2)
{		{
struct local_sysmaps *sysm;		critical_enter();
pt_entry_t *pte, npte;		*PCPU_GET(cmap1_ptep) =
vm_offset_t va1, va2;		TLBLO_PA_TO_PFN(phys1) \| PTE_C_CACHE \| PTE_D \| PTE_V \| PTE_G;
uint32_t intr;		*PCPU_GET(cmap2_ptep) =
int cpu;		TLBLO_PA_TO_PFN(phys2) \| PTE_C_CACHE \| PTE_D \| PTE_V \| PTE_G;
		return (PCPU_GET(cmap1_addr));
intr = intr_disable();
cpu = PCPU_GET(cpuid);
sysm = &sysmap_lmem[cpu];
sysm->saved_intr = intr;
va1 = sysm->base;
va2 = sysm->base + PAGE_SIZE;
npte = TLBLO_PA_TO_PFN(phys1) \| PTE_C_CACHE \| PTE_D \| PTE_V \| PTE_G;
pte = pmap_pte(kernel_pmap, va1);
*pte = npte;
npte = TLBLO_PA_TO_PFN(phys2) \| PTE_C_CACHE \| PTE_D \| PTE_V \| PTE_G;
pte = pmap_pte(kernel_pmap, va2);
*pte = npte;
sysm->valid1 = 1;
sysm->valid2 = 1;
return (va1);
}		}

static __inline void		static __inline void
pmap_lmem_unmap(void)		pmap_lmem_unmap(void)
{		{
struct local_sysmaps *sysm;		*PCPU_GET(cmap1_ptep) = PTE_G;
pt_entry_t *pte;		tlb_invalidate_address(kernel_pmap, PCPU_GET(cmap1_addr));
int cpu;		if (*PCPU_GET(cmap2_ptep) != PTE_G) {
		*PCPU_GET(cmap2_ptep) = PTE_G;
cpu = PCPU_GET(cpuid);		tlb_invalidate_address(kernel_pmap, PCPU_GET(cmap2_addr));
sysm = &sysmap_lmem[cpu];
pte = pmap_pte(kernel_pmap, sysm->base);
*pte = PTE_G;
tlb_invalidate_address(kernel_pmap, sysm->base);
sysm->valid1 = 0;
if (sysm->valid2) {
pte = pmap_pte(kernel_pmap, sysm->base + PAGE_SIZE);
*pte = PTE_G;
tlb_invalidate_address(kernel_pmap, sysm->base + PAGE_SIZE);
sysm->valid2 = 0;
}		}
intr_restore(sysm->saved_intr);		critical_exit();
}		}

#else /* __mips_n64 */		#else /* __mips_n64 */

static __inline void		static __inline void
pmap_alloc_lmem_map(void)		pmap_alloc_lmem_map(void)
{		{
}		}

static __inline vm_offset_t		static __inline vm_offset_t
▲ Show 20 Lines • Show All 194 Lines • ▼ Show 20 Lines	#endif
kernel_pmap->pm_asid[0].gen = 0;		kernel_pmap->pm_asid[0].gen = 0;
kernel_vm_end += nkpt * NPTEPG * PAGE_SIZE;		kernel_vm_end += nkpt * NPTEPG * PAGE_SIZE;
}		}

void		void
pmap_bootstrap(void)		pmap_bootstrap(void)
{		{
int i;		int i;
int need_local_mappings = 0;

/* Sort. */		/* Sort. */
again:		again:
for (i = 0; phys_avail[i + 1] != 0; i += 2) {		for (i = 0; phys_avail[i + 1] != 0; i += 2) {
/*		/*
* Keep the memory aligned on page boundary.		* Keep the memory aligned on page boundary.
*/		*/
phys_avail[i] = round_page(phys_avail[i]);		phys_avail[i] = round_page(phys_avail[i]);
▲ Show 20 Lines • Show All 76 Lines • ▼ Show 20 Lines	#ifdef SMP
* in KSEG0 so there was no need for a TLB mapping.		* in KSEG0 so there was no need for a TLB mapping.
*/		*/
mips_pcpu_tlb_init(PCPU_ADDR(0));		mips_pcpu_tlb_init(PCPU_ADDR(0));

if (bootverbose)		if (bootverbose)
printf("pcpu is available at virtual address %p.\n", pcpup);		printf("pcpu is available at virtual address %p.\n", pcpup);
#endif		#endif

		pmap_create_kernel_pagetable();
if (need_local_mappings)		if (need_local_mappings)
pmap_alloc_lmem_map();		pmap_alloc_lmem_map();
pmap_create_kernel_pagetable();
pmap_max_asid = VMNUM_PIDS;		pmap_max_asid = VMNUM_PIDS;
mips_wr_entryhi(0);		mips_wr_entryhi(0);
mips_wr_pagemask(0);		mips_wr_pagemask(0);

/*		/*
* Initialize the global pv list lock.		* Initialize the global pv list lock.
*/		*/
rw_init(&pvh_global_lock, "pmap pv global");		rw_init(&pvh_global_lock, "pmap pv global");
▲ Show 20 Lines • Show All 1,740 Lines • ▼ Show 20 Lines	pmap_kenter_temporary(vm_paddr_t pa, int i)
if (i != 0)		if (i != 0)
printf("%s: ERROR!!! More than one page of virtual address mapping not supported\n",		printf("%s: ERROR!!! More than one page of virtual address mapping not supported\n",
__func__);		__func__);

if (MIPS_DIRECT_MAPPABLE(pa)) {		if (MIPS_DIRECT_MAPPABLE(pa)) {
va = MIPS_PHYS_TO_DIRECT(pa);		va = MIPS_PHYS_TO_DIRECT(pa);
} else {		} else {
#ifndef __mips_n64 /* XXX : to be converted to new style */		#ifndef __mips_n64 /* XXX : to be converted to new style */
int cpu;
register_t intr;
struct local_sysmaps *sysm;
pt_entry_t *pte, npte;		pt_entry_t *pte, npte;

/* If this is used other than for dumps, we may need to leave		pte = pmap_pte(kernel_pmap, crashdumpva);
* interrupts disasbled on return. If crash dumps don't work when
* we get to this point, we might want to consider this (leaving things
* disabled as a starting point ;-)
*/
intr = intr_disable();
cpu = PCPU_GET(cpuid);
sysm = &sysmap_lmem[cpu];
/* Since this is for the debugger, no locks or any other fun */		/* Since this is for the debugger, no locks or any other fun */
npte = TLBLO_PA_TO_PFN(pa) \| PTE_C_CACHE \| PTE_D \| PTE_V \|		npte = TLBLO_PA_TO_PFN(pa) \| PTE_C_CACHE \| PTE_D \| PTE_V \|
PTE_G;		PTE_G;
pte = pmap_pte(kernel_pmap, sysm->base);
*pte = npte;		*pte = npte;
sysm->valid1 = 1;		pmap_update_page(kernel_pmap, crashdumpva, npte);
pmap_update_page(kernel_pmap, sysm->base, npte);		va = crashdumpva;
va = sysm->base;
intr_restore(intr);
#endif		#endif
}		}
return ((void *)va);		return ((void *)va);
}		}

void		void
pmap_kenter_temporary_free(vm_paddr_t pa)		pmap_kenter_temporary_free(vm_paddr_t pa)
{		{
#ifndef __mips_n64 /* XXX : to be converted to new style */		#ifndef __mips_n64 /* XXX : to be converted to new style */
int cpu;		pt_entry_t *pte;
register_t intr;
struct local_sysmaps *sysm;
#endif		#endif

if (MIPS_DIRECT_MAPPABLE(pa)) {		if (MIPS_DIRECT_MAPPABLE(pa)) {
/* nothing to do for this case */		/* nothing to do for this case */
return;		return;
}		}
#ifndef __mips_n64 /* XXX : to be converted to new style */		#ifndef __mips_n64 /* XXX : to be converted to new style */
cpu = PCPU_GET(cpuid);		pte = pmap_pte(kernel_pmap, crashdumpva);
sysm = &sysmap_lmem[cpu];
if (sysm->valid1) {
pt_entry_t *pte;

intr = intr_disable();
pte = pmap_pte(kernel_pmap, sysm->base);
*pte = PTE_G;		*pte = PTE_G;
pmap_invalidate_page(kernel_pmap, sysm->base);		pmap_invalidate_page(kernel_pmap, crashdumpva);
intr_restore(intr);
sysm->valid1 = 0;
}
#endif		#endif
}		}

/*		/*
* Maps a sequence of resident pages belonging to the same object.		* Maps a sequence of resident pages belonging to the same object.
* The sequence begins with the given page m_start. This page is		* The sequence begins with the given page m_start. This page is
* mapped at the given virtual address start. Each subsequent page is		* mapped at the given virtual address start. Each subsequent page is
* mapped at a virtual address that is offset from start by the same		* mapped at a virtual address that is offset from start by the same
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}		}

vm_offset_t		vm_offset_t
pmap_quick_enter_page(vm_page_t m)		pmap_quick_enter_page(vm_page_t m)
{		{
#if defined(__mips_n64)		#if defined(__mips_n64)
return MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m));		return MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m));
#else		#else
		vm_offset_t qaddr;
vm_paddr_t pa;		vm_paddr_t pa;
struct local_sysmaps *sysm;
pt_entry_t *pte, npte;		pt_entry_t *pte, npte;

pa = VM_PAGE_TO_PHYS(m);		pa = VM_PAGE_TO_PHYS(m);

if (MIPS_DIRECT_MAPPABLE(pa)) {		if (MIPS_DIRECT_MAPPABLE(pa)) {
if (pmap_page_get_memattr(m) != VM_MEMATTR_WRITE_BACK)		if (pmap_page_get_memattr(m) != VM_MEMATTR_WRITE_BACK)
return (MIPS_PHYS_TO_DIRECT_UNCACHED(pa));		return (MIPS_PHYS_TO_DIRECT_UNCACHED(pa));
else		else
return (MIPS_PHYS_TO_DIRECT(pa));		return (MIPS_PHYS_TO_DIRECT(pa));
}		}
critical_enter();		critical_enter();
sysm = &sysmap_lmem[PCPU_GET(cpuid)];		qaddr = PCPU_GET(qmap_addr);
		pte = PCPU_GET(qmap_ptep);

KASSERT(sysm->valid1 == 0, ("pmap_quick_enter_page: PTE busy"));		KASSERT(*pte == PTE_G, ("pmap_quick_enter_page: PTE busy"));

pte = pmap_pte(kernel_pmap, sysm->base);
npte = TLBLO_PA_TO_PFN(pa) \| PTE_D \| PTE_V \| PTE_G;		npte = TLBLO_PA_TO_PFN(pa) \| PTE_D \| PTE_V \| PTE_G;
PMAP_PTE_SET_CACHE_BITS(npte, pa, m);		PMAP_PTE_SET_CACHE_BITS(npte, pa, m);
*pte = npte;		*pte = npte;
sysm->valid1 = 1;

return (sysm->base);		return (qaddr);
#endif		#endif
}		}

void		void
pmap_quick_remove_page(vm_offset_t addr)		pmap_quick_remove_page(vm_offset_t addr)
{		{
mips_dcache_wbinv_range(addr, PAGE_SIZE);		mips_dcache_wbinv_range(addr, PAGE_SIZE);
		jahAuthorUnsubmitted Not Done Inline Actions One thing I've been curious about looking thru the mips pmap is the need to clean the cache every time we remove a mapping. It seems like MIPS d-caches are always VIPT these days, so I'd naively expect the physical tag to allow eviction to work even in the absence of a valid mapping. Is this just an architectural requirement I'm not familiar with, or is it a mitigation against cache aliasing, or something else entirely? I ask about the aliasing thing because I vaguely recall a post on -developers or -arch maybe ~3yrs ago that mentioned the pmap isn't doing what it should to prevent alias-related corruption. Based on the MIPS docs I've read, it does seem like that's possible with certain combinations of (large way size + small page size + no hardware anti-alias). jah: One thing I've been curious about looking thru the mips pmap is the need to clean the cache…

#if !defined(__mips_n64)		#if !defined(__mips_n64)
struct local_sysmaps *sysm;
pt_entry_t *pte;		pt_entry_t *pte;

if (addr >= MIPS_KSEG0_START && addr < MIPS_KSEG0_END)		if (addr >= MIPS_KSEG0_START && addr < MIPS_KSEG0_END)
return;		return;

sysm = &sysmap_lmem[PCPU_GET(cpuid)];		pte = PCPU_GET(qmap_ptep);

KASSERT(sysm->valid1 != 0,		KASSERT(*pte != PTE_G,
("pmap_quick_remove_page: PTE not in use"));		("pmap_quick_remove_page: PTE not in use"));
KASSERT(sysm->base == addr,		KASSERT(PCPU_GET(qmap_addr) == addr,
("pmap_quick_remove_page: invalid address"));		("pmap_quick_remove_page: invalid address"));

pte = pmap_pte(kernel_pmap, addr);
*pte = PTE_G;		*pte = PTE_G;
tlb_invalidate_address(kernel_pmap, addr);		tlb_invalidate_address(kernel_pmap, addr);
sysm->valid1 = 0;
critical_exit();		critical_exit();
#endif		#endif
}		}

/*		/*
* Returns true if the pmap's pv is one of the first		* Returns true if the pmap's pv is one of the first
* 16 pvs linked to from this page. This count may		* 16 pvs linked to from this page. This count may
* be changed upwards or downwards in the future; it		* be changed upwards or downwards in the future; it
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vm_map_protect(9) fails to document KERN_RESOURCE_SHORTAGE return value.
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Diff 59016

vm_map_protect.9

vm_map_protect(9) fails to document KERN_RESOURCE_SHORTAGE return value.ClosedPublicActions

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Diff 59016

vm_map_protect.9

vm_map_protect(9) fails to document KERN_RESOURCE_SHORTAGE return value.
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