As the next step in making vmalloc/vfree available to every other architecture,
register the available memory with phys_alloc for x86 too, and add a service
to return the unused phys_alloc region. This makes setup_vm architecture-
independent.
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
lib/alloc_page.c | 2 +-
lib/alloc_phys.c | 6 ++++++
lib/alloc_phys.h | 6 ++++++
lib/libcflat.h | 2 ++
lib/vmalloc.c | 14 ++++++++++++++
lib/x86/asm/page.h | 2 ++
lib/x86/setup.c | 4 ++++
lib/x86/vm.c | 27 ++++++++-------------------
lib/x86/vm.h | 1 -
x86/Makefile.common | 1 +
10 files changed, 44 insertions(+), 21 deletions(-)
diff --git a/lib/alloc_page.c b/lib/alloc_page.c
index de6fd6f..271b8aa 100644
--- a/lib/alloc_page.c
+++ b/lib/alloc_page.c
@@ -5,6 +5,7 @@
* with page granularity.
*/
#include "libcflat.h"
+#include "alloc_phys.h"
#include <asm/page.h>
#include <asm/io.h>
@@ -113,4 +114,3 @@ void free_page(void *page)
*(void **)page = free;
free = page;
}
-
diff --git a/lib/alloc_phys.c b/lib/alloc_phys.c
index 3972277..6befb5c 100644
--- a/lib/alloc_phys.c
+++ b/lib/alloc_phys.c
@@ -107,6 +107,12 @@ static phys_addr_t phys_alloc_aligned_safe(phys_addr_t size,
return addr;
}
+void phys_alloc_get_unused(phys_addr_t *p_base, phys_addr_t *p_top)
+{
+ *p_base = base;
+ *p_top = top;
+}
+
static void *early_memalign(size_t alignment, size_t size)
{
phys_addr_t addr;
diff --git a/lib/alloc_phys.h b/lib/alloc_phys.h
index f09d667..848d3db 100644
--- a/lib/alloc_phys.h
+++ b/lib/alloc_phys.h
@@ -36,4 +36,10 @@ extern void phys_alloc_set_minimum_alignment(phys_addr_t align);
*/
extern void phys_alloc_show(void);
+/*
+ * phys_alloc_get_unused returns the addresses for the still-unused part
+ * of the initial free memory region passed to phys_alloc_init.
+ */
+extern void phys_alloc_get_unused(phys_addr_t *p_base, phys_addr_t *p_top);
+
#endif /* _ALLOC_PHYS_H_ */
diff --git a/lib/libcflat.h b/lib/libcflat.h
index a5c4290..fb46541 100644
--- a/lib/libcflat.h
+++ b/lib/libcflat.h
@@ -156,4 +156,6 @@ static inline bool is_power_of_2(unsigned long n)
void binstr(unsigned long x, char out[BINSTR_SZ]);
void print_binstr(unsigned long x);
+extern void setup_vm(void);
+
#endif
diff --git a/lib/vmalloc.c b/lib/vmalloc.c
index 877c883..c2abe3c 100644
--- a/lib/vmalloc.c
+++ b/lib/vmalloc.c
@@ -8,9 +8,12 @@
#include "libcflat.h"
#include "asm/spinlock.h"
#include "asm/page.h"
+#include "alloc_phys.h"
+#include "alloc_page.h"
static struct spinlock lock;
static void *vfree_top = 0;
+static void *page_root;
void *alloc_vpages(ulong nr)
{
@@ -29,3 +32,14 @@ void init_alloc_vpage(void *top)
{
vfree_top = top;
}
+
+void setup_vm()
+{
+ phys_addr_t base, top;
+ phys_alloc_get_unused(&base, &top);
+ base = (base + PAGE_SIZE - 1) & -PAGE_SIZE;
+ top = top & -PAGE_SIZE;
+
+ free_pages((void *)base, top - base);
+ page_root = setup_mmu(top);
+}
diff --git a/lib/x86/asm/page.h b/lib/x86/asm/page.h
index 562594d..154d45e 100644
--- a/lib/x86/asm/page.h
+++ b/lib/x86/asm/page.h
@@ -46,5 +46,7 @@
#define PGDIR_BITS(lvl) (((lvl) - 1) * PGDIR_WIDTH + PAGE_SHIFT)
#define PGDIR_OFFSET(va, lvl) (((va) >> PGDIR_BITS(lvl)) & PGDIR_MASK)
+extern void *setup_mmu(unsigned long top);
+
#endif /* !__ASSEMBLY__ */
#endif
diff --git a/lib/x86/setup.c b/lib/x86/setup.c
index 22257a7..f6a8ea8 100644
--- a/lib/x86/setup.c
+++ b/lib/x86/setup.c
@@ -53,6 +53,10 @@ void setup_multiboot(struct mbi_bootinfo *bootinfo)
initrd = (char *)(uintptr_t) mods->start;
initrd_size = mods->end - mods->start;
+
+ /* TODO: use e820 */
+ u64 end_of_memory = bootinfo->mem_upper * 1024ull;
+ phys_alloc_init((uintptr_t) &edata, end_of_memory - (uintptr_t)edata);
}
void setup_libcflat(void)
diff --git a/lib/x86/vm.c b/lib/x86/vm.c
index d2a3c59..f6f20e5 100644
--- a/lib/x86/vm.c
+++ b/lib/x86/vm.c
@@ -1,12 +1,8 @@
-#include "fwcfg.h"
#include "vm.h"
#include "libcflat.h"
#include "vmalloc.h"
#include "alloc_page.h"
-extern char edata;
-static unsigned long end_of_memory;
-
unsigned long *install_pte(unsigned long *cr3,
int pte_level,
void *virt,
@@ -149,23 +145,23 @@ static void setup_mmu_range(unsigned long *cr3, unsigned long start,
install_pages(cr3, phys, max - phys, (void *)(ulong)phys);
}
-static void setup_mmu(unsigned long len)
+void *setup_mmu(unsigned long end_of_memory)
{
unsigned long *cr3 = alloc_page();
memset(cr3, 0, PAGE_SIZE);
#ifdef __x86_64__
- if (len < (1ul << 32))
- len = (1ul << 32); /* map mmio 1:1 */
+ if (end_of_memory < (1ul << 32))
+ end_of_memory = (1ul << 32); /* map mmio 1:1 */
- setup_mmu_range(cr3, 0, len);
+ setup_mmu_range(cr3, 0, end_of_memory);
#else
- if (len > (1ul << 31))
- len = (1ul << 31);
+ if (end_of_memory > (1ul << 31))
+ end_of_memory = (1ul << 31);
/* 0 - 2G memory, 2G-3G valloc area, 3G-4G mmio */
- setup_mmu_range(cr3, 0, len);
+ setup_mmu_range(cr3, 0, end_of_memory);
setup_mmu_range(cr3, 3ul << 30, (1ul << 30));
init_alloc_vpage((void*)(3ul << 30));
#endif
@@ -180,14 +176,7 @@ static void setup_mmu(unsigned long len)
printf("cr0 = %lx\n", read_cr0());
printf("cr3 = %lx\n", read_cr3());
printf("cr4 = %lx\n", read_cr4());
-}
-
-void setup_vm()
-{
- assert(!end_of_memory);
- end_of_memory = fwcfg_get_u64(FW_CFG_RAM_SIZE);
- free_pages(&edata, end_of_memory - (unsigned long)&edata);
- setup_mmu(end_of_memory);
+ return cr3;
}
void *vmalloc(unsigned long size)
diff --git a/lib/x86/vm.h b/lib/x86/vm.h
index 4a7888b..c3211eb 100644
--- a/lib/x86/vm.h
+++ b/lib/x86/vm.h
@@ -5,7 +5,6 @@
#include "asm/page.h"
#include "asm/io.h"
-void setup_vm();
void setup_5level_page_table();
void *vmalloc(unsigned long size);
diff --git a/x86/Makefile.common b/x86/Makefile.common
index fce0801..f0fbadf 100644
--- a/x86/Makefile.common
+++ b/x86/Makefile.common
@@ -6,6 +6,7 @@ cflatobjs += lib/pci.o
cflatobjs += lib/pci-edu.o
cflatobjs += lib/vmalloc.o
cflatobjs += lib/alloc_page.o
+cflatobjs += lib/alloc_phys.o
cflatobjs += lib/x86/setup.o
cflatobjs += lib/x86/io.o
cflatobjs += lib/x86/smp.o
--
2.14.2
