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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v9 5/8] xen/arm: Split MMU-specific setup_mm() and related code out
setup_mm() is used for Xen to setup memory management subsystem,
such as boot allocator, direct-mapping, xenheap initialization,
frametable and static memory pages, at boot time.
We could inherit some components seamlessly for MPU support, such
as the setup of boot allocator, whilst we need to implement some
components differently for MPU, such as xenheap, etc. Also, there
are some components that is specific to MMU only, for example the
direct-mapping.
Therefore in this commit, we split the MMU-specific setup_mm() and
related code out. Since arm32 and arm64 have completely different
setup_mm() implementation, take the opportunity to split the
arch-specific setup_mm() to arch-specific files, so that we can
avoid #ifdef. Also, make init_pdx(), init_staticmem_pages(), and
populate_boot_allocator() public as these functions are now called
from two different units, and make setup_mm() public for future MPU
implementation.
With above code movement, mark setup_directmap_mappings() as static
because the only caller of this function is now in the same file
with it. Drop the original setup_directmap_mappings() declaration
and move the in-code comment on top of the declaration on top of
the function implementation.
Signed-off-by: Henry Wang <Henry.Wang@xxxxxxx>
Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
---
v9:
- No change.
v8:
- Reword the commit message about making init_pdx() & co public.
- Add Julien's Acked-by tag.
v7:
- No change.
v6:
- Rework the original patch:
[v5,10/13] xen/arm: mmu: move MMU-specific setup_mm to mmu/setup.c
---
xen/arch/arm/arm32/mmu/mm.c | 278 ++++++++++++++++++++++++-
xen/arch/arm/arm64/mmu/mm.c | 51 ++++-
xen/arch/arm/include/asm/mmu/mm.h | 6 -
xen/arch/arm/include/asm/setup.h | 5 +
xen/arch/arm/setup.c | 324 +-----------------------------
5 files changed, 331 insertions(+), 333 deletions(-)
diff --git a/xen/arch/arm/arm32/mmu/mm.c b/xen/arch/arm/arm32/mmu/mm.c
index 647baf4a81..94d6cab49c 100644
--- a/xen/arch/arm/arm32/mmu/mm.c
+++ b/xen/arch/arm/arm32/mmu/mm.c
@@ -1,14 +1,21 @@
/* SPDX-License-Identifier: GPL-2.0 */
#include <xen/init.h>
+#include <xen/lib.h>
+#include <xen/libfdt/libfdt-xen.h>
+#include <xen/param.h>
+#include <xen/pfn.h>
#include <asm/fixmap.h>
+static unsigned long opt_xenheap_megabytes __initdata;
+integer_param("xenheap_megabytes", opt_xenheap_megabytes);
+
/*
- * Set up the direct-mapped xenheap:
- * up to 1GB of contiguous, always-mapped memory.
+ * Set up the direct-mapped xenheap: up to 1GB of contiguous,
+ * always-mapped memory. Base must be 32MB aligned and size a multiple of 32MB.
*/
-void __init setup_directmap_mappings(unsigned long base_mfn,
- unsigned long nr_mfns)
+static void __init setup_directmap_mappings(unsigned long base_mfn,
+ unsigned long nr_mfns)
{
int rc;
@@ -21,6 +28,269 @@ void __init setup_directmap_mappings(unsigned long base_mfn,
directmap_virt_end = XENHEAP_VIRT_START + nr_mfns * PAGE_SIZE;
}
+/*
+ * Returns the end address of the highest region in the range s..e
+ * with required size and alignment that does not conflict with the
+ * modules from first_mod to nr_modules.
+ *
+ * For non-recursive callers first_mod should normally be 0 (all
+ * modules and Xen itself) or 1 (all modules but not Xen).
+ */
+static paddr_t __init consider_modules(paddr_t s, paddr_t e,
+ uint32_t size, paddr_t align,
+ int first_mod)
+{
+ const struct bootmodules *mi = &bootinfo.modules;
+ int i;
+ int nr;
+
+ s = (s+align-1) & ~(align-1);
+ e = e & ~(align-1);
+
+ if ( s > e || e - s < size )
+ return 0;
+
+ /* First check the boot modules */
+ for ( i = first_mod; i < mi->nr_mods; i++ )
+ {
+ paddr_t mod_s = mi->module[i].start;
+ paddr_t mod_e = mod_s + mi->module[i].size;
+
+ if ( s < mod_e && mod_s < e )
+ {
+ mod_e = consider_modules(mod_e, e, size, align, i+1);
+ if ( mod_e )
+ return mod_e;
+
+ return consider_modules(s, mod_s, size, align, i+1);
+ }
+ }
+
+ /* Now check any fdt reserved areas. */
+
+ nr = fdt_num_mem_rsv(device_tree_flattened);
+
+ for ( ; i < mi->nr_mods + nr; i++ )
+ {
+ paddr_t mod_s, mod_e;
+
+ if ( fdt_get_mem_rsv_paddr(device_tree_flattened,
+ i - mi->nr_mods,
+ &mod_s, &mod_e ) < 0 )
+ /* If we can't read it, pretend it doesn't exist... */
+ continue;
+
+ /* fdt_get_mem_rsv_paddr returns length */
+ mod_e += mod_s;
+
+ if ( s < mod_e && mod_s < e )
+ {
+ mod_e = consider_modules(mod_e, e, size, align, i+1);
+ if ( mod_e )
+ return mod_e;
+
+ return consider_modules(s, mod_s, size, align, i+1);
+ }
+ }
+
+ /*
+ * i is the current bootmodule we are evaluating, across all
+ * possible kinds of bootmodules.
+ *
+ * When retrieving the corresponding reserved-memory addresses, we
+ * need to index the bootinfo.reserved_mem bank starting from 0, and
+ * only counting the reserved-memory modules. Hence, we need to use
+ * i - nr.
+ */
+ nr += mi->nr_mods;
+ for ( ; i - nr < bootinfo.reserved_mem.nr_banks; i++ )
+ {
+ paddr_t r_s = bootinfo.reserved_mem.bank[i - nr].start;
+ paddr_t r_e = r_s + bootinfo.reserved_mem.bank[i - nr].size;
+
+ if ( s < r_e && r_s < e )
+ {
+ r_e = consider_modules(r_e, e, size, align, i + 1);
+ if ( r_e )
+ return r_e;
+
+ return consider_modules(s, r_s, size, align, i + 1);
+ }
+ }
+ return e;
+}
+
+/*
+ * Find a contiguous region that fits in the static heap region with
+ * required size and alignment, and return the end address of the region
+ * if found otherwise 0.
+ */
+static paddr_t __init fit_xenheap_in_static_heap(uint32_t size, paddr_t align)
+{
+ unsigned int i;
+ paddr_t end = 0, aligned_start, aligned_end;
+ paddr_t bank_start, bank_size, bank_end;
+
+ for ( i = 0 ; i < bootinfo.reserved_mem.nr_banks; i++ )
+ {
+ if ( bootinfo.reserved_mem.bank[i].type != MEMBANK_STATIC_HEAP )
+ continue;
+
+ bank_start = bootinfo.reserved_mem.bank[i].start;
+ bank_size = bootinfo.reserved_mem.bank[i].size;
+ bank_end = bank_start + bank_size;
+
+ if ( bank_size < size )
+ continue;
+
+ aligned_end = bank_end & ~(align - 1);
+ aligned_start = (aligned_end - size) & ~(align - 1);
+
+ if ( aligned_start > bank_start )
+ /*
+ * Allocate the xenheap as high as possible to keep low-memory
+ * available (assuming the admin supplied region below 4GB)
+ * for other use (e.g. domain memory allocation).
+ */
+ end = max(end, aligned_end);
+ }
+
+ return end;
+}
+
+void __init setup_mm(void)
+{
+ paddr_t ram_start, ram_end, ram_size, e, bank_start, bank_end, bank_size;
+ paddr_t static_heap_end = 0, static_heap_size = 0;
+ unsigned long heap_pages, xenheap_pages, domheap_pages;
+ unsigned int i;
+ const uint32_t ctr = READ_CP32(CTR);
+
+ if ( !bootinfo.mem.nr_banks )
+ panic("No memory bank\n");
+
+ /* We only supports instruction caches implementing the IVIPT extension. */
+ if ( ((ctr >> CTR_L1IP_SHIFT) & CTR_L1IP_MASK) == ICACHE_POLICY_AIVIVT )
+ panic("AIVIVT instruction cache not supported\n");
+
+ init_pdx();
+
+ ram_start = bootinfo.mem.bank[0].start;
+ ram_size = bootinfo.mem.bank[0].size;
+ ram_end = ram_start + ram_size;
+
+ for ( i = 1; i < bootinfo.mem.nr_banks; i++ )
+ {
+ bank_start = bootinfo.mem.bank[i].start;
+ bank_size = bootinfo.mem.bank[i].size;
+ bank_end = bank_start + bank_size;
+
+ ram_size = ram_size + bank_size;
+ ram_start = min(ram_start,bank_start);
+ ram_end = max(ram_end,bank_end);
+ }
+
+ total_pages = ram_size >> PAGE_SHIFT;
+
+ if ( bootinfo.static_heap )
+ {
+ for ( i = 0 ; i < bootinfo.reserved_mem.nr_banks; i++ )
+ {
+ if ( bootinfo.reserved_mem.bank[i].type != MEMBANK_STATIC_HEAP )
+ continue;
+
+ bank_start = bootinfo.reserved_mem.bank[i].start;
+ bank_size = bootinfo.reserved_mem.bank[i].size;
+ bank_end = bank_start + bank_size;
+
+ static_heap_size += bank_size;
+ static_heap_end = max(static_heap_end, bank_end);
+ }
+
+ heap_pages = static_heap_size >> PAGE_SHIFT;
+ }
+ else
+ heap_pages = total_pages;
+
+ /*
+ * If the user has not requested otherwise via the command line
+ * then locate the xenheap using these constraints:
+ *
+ * - must be contiguous
+ * - must be 32 MiB aligned
+ * - must not include Xen itself or the boot modules
+ * - must be at most 1GB or 1/32 the total RAM in the system (or static
+ heap if enabled) if less
+ * - must be at least 32M
+ *
+ * We try to allocate the largest xenheap possible within these
+ * constraints.
+ */
+ if ( opt_xenheap_megabytes )
+ xenheap_pages = opt_xenheap_megabytes << (20-PAGE_SHIFT);
+ else
+ {
+ xenheap_pages = (heap_pages/32 + 0x1fffUL) & ~0x1fffUL;
+ xenheap_pages = max(xenheap_pages, 32UL<<(20-PAGE_SHIFT));
+ xenheap_pages = min(xenheap_pages, 1UL<<(30-PAGE_SHIFT));
+ }
+
+ do
+ {
+ e = bootinfo.static_heap ?
+ fit_xenheap_in_static_heap(pfn_to_paddr(xenheap_pages), MB(32)) :
+ consider_modules(ram_start, ram_end,
+ pfn_to_paddr(xenheap_pages),
+ 32<<20, 0);
+ if ( e )
+ break;
+
+ xenheap_pages >>= 1;
+ } while ( !opt_xenheap_megabytes && xenheap_pages > 32<<(20-PAGE_SHIFT) );
+
+ if ( ! e )
+ panic("Not enough space for xenheap\n");
+
+ domheap_pages = heap_pages - xenheap_pages;
+
+ printk("Xen heap: %"PRIpaddr"-%"PRIpaddr" (%lu pages%s)\n",
+ e - (pfn_to_paddr(xenheap_pages)), e, xenheap_pages,
+ opt_xenheap_megabytes ? ", from command-line" : "");
+ printk("Dom heap: %lu pages\n", domheap_pages);
+
+ /*
+ * We need some memory to allocate the page-tables used for the
+ * directmap mappings. So populate the boot allocator first.
+ *
+ * This requires us to set directmap_mfn_{start, end} first so the
+ * direct-mapped Xenheap region can be avoided.
+ */
+ directmap_mfn_start = _mfn((e >> PAGE_SHIFT) - xenheap_pages);
+ directmap_mfn_end = mfn_add(directmap_mfn_start, xenheap_pages);
+
+ populate_boot_allocator();
+
+ setup_directmap_mappings(mfn_x(directmap_mfn_start), xenheap_pages);
+
+ /* Frame table covers all of RAM region, including holes */
+ setup_frametable_mappings(ram_start, ram_end);
+ max_page = PFN_DOWN(ram_end);
+
+ /*
+ * The allocators may need to use map_domain_page() (such as for
+ * scrubbing pages). So we need to prepare the domheap area first.
+ */
+ if ( !init_domheap_mappings(smp_processor_id()) )
+ panic("CPU%u: Unable to prepare the domheap page-tables\n",
+ smp_processor_id());
+
+ /* Add xenheap memory that was not already added to the boot allocator. */
+ init_xenheap_pages(mfn_to_maddr(directmap_mfn_start),
+ mfn_to_maddr(directmap_mfn_end));
+
+ init_staticmem_pages();
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/arch/arm/arm64/mmu/mm.c b/xen/arch/arm/arm64/mmu/mm.c
index e68edd6151..e05d54c850 100644
--- a/xen/arch/arm/arm64/mmu/mm.c
+++ b/xen/arch/arm/arm64/mmu/mm.c
@@ -2,6 +2,7 @@
#include <xen/init.h>
#include <xen/mm.h>
+#include <xen/pfn.h>
#include <asm/setup.h>
@@ -154,8 +155,8 @@ void __init switch_ttbr(uint64_t ttbr)
}
/* Map the region in the directmap area. */
-void __init setup_directmap_mappings(unsigned long base_mfn,
- unsigned long nr_mfns)
+static void __init setup_directmap_mappings(unsigned long base_mfn,
+ unsigned long nr_mfns)
{
int rc;
@@ -190,6 +191,52 @@ void __init setup_directmap_mappings(unsigned long
base_mfn,
panic("Unable to setup the directmap mappings.\n");
}
+void __init setup_mm(void)
+{
+ const struct meminfo *banks = &bootinfo.mem;
+ paddr_t ram_start = INVALID_PADDR;
+ paddr_t ram_end = 0;
+ paddr_t ram_size = 0;
+ unsigned int i;
+
+ init_pdx();
+
+ /*
+ * We need some memory to allocate the page-tables used for the directmap
+ * mappings. But some regions may contain memory already allocated
+ * for other uses (e.g. modules, reserved-memory...).
+ *
+ * For simplicity, add all the free regions in the boot allocator.
+ */
+ populate_boot_allocator();
+
+ total_pages = 0;
+
+ for ( i = 0; i < banks->nr_banks; i++ )
+ {
+ const struct membank *bank = &banks->bank[i];
+ paddr_t bank_end = bank->start + bank->size;
+
+ ram_size = ram_size + bank->size;
+ ram_start = min(ram_start, bank->start);
+ ram_end = max(ram_end, bank_end);
+
+ setup_directmap_mappings(PFN_DOWN(bank->start),
+ PFN_DOWN(bank->size));
+ }
+
+ total_pages += ram_size >> PAGE_SHIFT;
+
+ directmap_virt_end = XENHEAP_VIRT_START + ram_end - ram_start;
+ directmap_mfn_start = maddr_to_mfn(ram_start);
+ directmap_mfn_end = maddr_to_mfn(ram_end);
+
+ setup_frametable_mappings(ram_start, ram_end);
+ max_page = PFN_DOWN(ram_end);
+
+ init_staticmem_pages();
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/arch/arm/include/asm/mmu/mm.h
b/xen/arch/arm/include/asm/mmu/mm.h
index 439ae314fd..c5e03a66bf 100644
--- a/xen/arch/arm/include/asm/mmu/mm.h
+++ b/xen/arch/arm/include/asm/mmu/mm.h
@@ -31,12 +31,6 @@ void dump_pt_walk(paddr_t ttbr, paddr_t addr,
/* Switch to a new root page-tables */
extern void switch_ttbr(uint64_t ttbr);
-/*
- * For Arm32, set up the direct-mapped xenheap: up to 1GB of contiguous,
- * always-mapped memory. Base must be 32MB aligned and size a multiple of 32MB.
- * For Arm64, map the region in the directmap area.
- */
-extern void setup_directmap_mappings(unsigned long base_mfn, unsigned long
nr_mfns);
#endif /* __ARM_MMU_MM_H__ */
diff --git a/xen/arch/arm/include/asm/setup.h b/xen/arch/arm/include/asm/setup.h
index 98af6f55f5..6c71f8c31b 100644
--- a/xen/arch/arm/include/asm/setup.h
+++ b/xen/arch/arm/include/asm/setup.h
@@ -160,6 +160,11 @@ struct bootcmdline
*boot_cmdline_find_by_kind(bootmodule_kind kind);
struct bootcmdline * boot_cmdline_find_by_name(const char *name);
const char *boot_module_kind_as_string(bootmodule_kind kind);
+void init_pdx(void);
+void init_staticmem_pages(void);
+void populate_boot_allocator(void);
+void setup_mm(void);
+
extern uint32_t hyp_traps_vector[];
void init_traps(void);
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 3f3a45719c..9b90185749 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -58,11 +58,6 @@ struct cpuinfo_arm __read_mostly system_cpuinfo;
bool __read_mostly acpi_disabled;
#endif
-#ifdef CONFIG_ARM_32
-static unsigned long opt_xenheap_megabytes __initdata;
-integer_param("xenheap_megabytes", opt_xenheap_megabytes);
-#endif
-
domid_t __read_mostly max_init_domid;
static __used void init_done(void)
@@ -547,138 +542,6 @@ static void * __init relocate_fdt(paddr_t dtb_paddr,
size_t dtb_size)
return fdt;
}
-#ifdef CONFIG_ARM_32
-/*
- * Returns the end address of the highest region in the range s..e
- * with required size and alignment that does not conflict with the
- * modules from first_mod to nr_modules.
- *
- * For non-recursive callers first_mod should normally be 0 (all
- * modules and Xen itself) or 1 (all modules but not Xen).
- */
-static paddr_t __init consider_modules(paddr_t s, paddr_t e,
- uint32_t size, paddr_t align,
- int first_mod)
-{
- const struct bootmodules *mi = &bootinfo.modules;
- int i;
- int nr;
-
- s = (s+align-1) & ~(align-1);
- e = e & ~(align-1);
-
- if ( s > e || e - s < size )
- return 0;
-
- /* First check the boot modules */
- for ( i = first_mod; i < mi->nr_mods; i++ )
- {
- paddr_t mod_s = mi->module[i].start;
- paddr_t mod_e = mod_s + mi->module[i].size;
-
- if ( s < mod_e && mod_s < e )
- {
- mod_e = consider_modules(mod_e, e, size, align, i+1);
- if ( mod_e )
- return mod_e;
-
- return consider_modules(s, mod_s, size, align, i+1);
- }
- }
-
- /* Now check any fdt reserved areas. */
-
- nr = fdt_num_mem_rsv(device_tree_flattened);
-
- for ( ; i < mi->nr_mods + nr; i++ )
- {
- paddr_t mod_s, mod_e;
-
- if ( fdt_get_mem_rsv_paddr(device_tree_flattened,
- i - mi->nr_mods,
- &mod_s, &mod_e ) < 0 )
- /* If we can't read it, pretend it doesn't exist... */
- continue;
-
- /* fdt_get_mem_rsv_paddr returns length */
- mod_e += mod_s;
-
- if ( s < mod_e && mod_s < e )
- {
- mod_e = consider_modules(mod_e, e, size, align, i+1);
- if ( mod_e )
- return mod_e;
-
- return consider_modules(s, mod_s, size, align, i+1);
- }
- }
-
- /*
- * i is the current bootmodule we are evaluating, across all
- * possible kinds of bootmodules.
- *
- * When retrieving the corresponding reserved-memory addresses, we
- * need to index the bootinfo.reserved_mem bank starting from 0, and
- * only counting the reserved-memory modules. Hence, we need to use
- * i - nr.
- */
- nr += mi->nr_mods;
- for ( ; i - nr < bootinfo.reserved_mem.nr_banks; i++ )
- {
- paddr_t r_s = bootinfo.reserved_mem.bank[i - nr].start;
- paddr_t r_e = r_s + bootinfo.reserved_mem.bank[i - nr].size;
-
- if ( s < r_e && r_s < e )
- {
- r_e = consider_modules(r_e, e, size, align, i + 1);
- if ( r_e )
- return r_e;
-
- return consider_modules(s, r_s, size, align, i + 1);
- }
- }
- return e;
-}
-
-/*
- * Find a contiguous region that fits in the static heap region with
- * required size and alignment, and return the end address of the region
- * if found otherwise 0.
- */
-static paddr_t __init fit_xenheap_in_static_heap(uint32_t size, paddr_t align)
-{
- unsigned int i;
- paddr_t end = 0, aligned_start, aligned_end;
- paddr_t bank_start, bank_size, bank_end;
-
- for ( i = 0 ; i < bootinfo.reserved_mem.nr_banks; i++ )
- {
- if ( bootinfo.reserved_mem.bank[i].type != MEMBANK_STATIC_HEAP )
- continue;
-
- bank_start = bootinfo.reserved_mem.bank[i].start;
- bank_size = bootinfo.reserved_mem.bank[i].size;
- bank_end = bank_start + bank_size;
-
- if ( bank_size < size )
- continue;
-
- aligned_end = bank_end & ~(align - 1);
- aligned_start = (aligned_end - size) & ~(align - 1);
-
- if ( aligned_start > bank_start )
- /*
- * Allocate the xenheap as high as possible to keep low-memory
- * available (assuming the admin supplied region below 4GB)
- * for other use (e.g. domain memory allocation).
- */
- end = max(end, aligned_end);
- }
-
- return end;
-}
-#endif
-
/*
* Return the end of the non-module region starting at s. In other
* words return s the start of the next modules after s.
@@ -713,7 +576,7 @@ static paddr_t __init next_module(paddr_t s, paddr_t *end)
return lowest;
}
-static void __init init_pdx(void)
+void __init init_pdx(void)
{
paddr_t bank_start, bank_size, bank_end;
@@ -758,7 +621,7 @@ static void __init init_pdx(void)
}
/* Static memory initialization */
-static void __init init_staticmem_pages(void)
+void __init init_staticmem_pages(void)
{
#ifdef CONFIG_STATIC_MEMORY
unsigned int bank;
@@ -792,7 +655,7 @@ static void __init init_staticmem_pages(void)
* allocator with the corresponding regions only, but with Xenheap excluded
* on arm32.
*/
-static void __init populate_boot_allocator(void)
+void __init populate_boot_allocator(void)
{
unsigned int i;
const struct meminfo *banks = &bootinfo.mem;
@@ -861,187 +724,6 @@ static void __init populate_boot_allocator(void)
}
}
-#ifdef CONFIG_ARM_32
-static void __init setup_mm(void)
-{
- paddr_t ram_start, ram_end, ram_size, e, bank_start, bank_end, bank_size;
- paddr_t static_heap_end = 0, static_heap_size = 0;
- unsigned long heap_pages, xenheap_pages, domheap_pages;
- unsigned int i;
- const uint32_t ctr = READ_CP32(CTR);
-
- if ( !bootinfo.mem.nr_banks )
- panic("No memory bank\n");
-
- /* We only supports instruction caches implementing the IVIPT extension. */
- if ( ((ctr >> CTR_L1IP_SHIFT) & CTR_L1IP_MASK) == ICACHE_POLICY_AIVIVT )
- panic("AIVIVT instruction cache not supported\n");
-
- init_pdx();
-
- ram_start = bootinfo.mem.bank[0].start;
- ram_size = bootinfo.mem.bank[0].size;
- ram_end = ram_start + ram_size;
-
- for ( i = 1; i < bootinfo.mem.nr_banks; i++ )
- {
- bank_start = bootinfo.mem.bank[i].start;
- bank_size = bootinfo.mem.bank[i].size;
- bank_end = bank_start + bank_size;
-
- ram_size = ram_size + bank_size;
- ram_start = min(ram_start,bank_start);
- ram_end = max(ram_end,bank_end);
- }
-
- total_pages = ram_size >> PAGE_SHIFT;
-
- if ( bootinfo.static_heap )
- {
- for ( i = 0 ; i < bootinfo.reserved_mem.nr_banks; i++ )
- {
- if ( bootinfo.reserved_mem.bank[i].type != MEMBANK_STATIC_HEAP )
- continue;
-
- bank_start = bootinfo.reserved_mem.bank[i].start;
- bank_size = bootinfo.reserved_mem.bank[i].size;
- bank_end = bank_start + bank_size;
-
- static_heap_size += bank_size;
- static_heap_end = max(static_heap_end, bank_end);
- }
-
- heap_pages = static_heap_size >> PAGE_SHIFT;
- }
- else
- heap_pages = total_pages;
-
- /*
- * If the user has not requested otherwise via the command line
- * then locate the xenheap using these constraints:
- *
- * - must be contiguous
- * - must be 32 MiB aligned
- * - must not include Xen itself or the boot modules
- * - must be at most 1GB or 1/32 the total RAM in the system (or static
- heap if enabled) if less
- * - must be at least 32M
- *
- * We try to allocate the largest xenheap possible within these
- * constraints.
- */
- if ( opt_xenheap_megabytes )
- xenheap_pages = opt_xenheap_megabytes << (20-PAGE_SHIFT);
- else
- {
- xenheap_pages = (heap_pages/32 + 0x1fffUL) & ~0x1fffUL;
- xenheap_pages = max(xenheap_pages, 32UL<<(20-PAGE_SHIFT));
- xenheap_pages = min(xenheap_pages, 1UL<<(30-PAGE_SHIFT));
- }
-
- do
- {
- e = bootinfo.static_heap ?
- fit_xenheap_in_static_heap(pfn_to_paddr(xenheap_pages), MB(32)) :
- consider_modules(ram_start, ram_end,
- pfn_to_paddr(xenheap_pages),
- 32<<20, 0);
- if ( e )
- break;
-
- xenheap_pages >>= 1;
- } while ( !opt_xenheap_megabytes && xenheap_pages > 32<<(20-PAGE_SHIFT) );
-
- if ( ! e )
- panic("Not enough space for xenheap\n");
-
- domheap_pages = heap_pages - xenheap_pages;
-
- printk("Xen heap: %"PRIpaddr"-%"PRIpaddr" (%lu pages%s)\n",
- e - (pfn_to_paddr(xenheap_pages)), e, xenheap_pages,
- opt_xenheap_megabytes ? ", from command-line" : "");
- printk("Dom heap: %lu pages\n", domheap_pages);
-
- /*
- * We need some memory to allocate the page-tables used for the
- * directmap mappings. So populate the boot allocator first.
- *
- * This requires us to set directmap_mfn_{start, end} first so the
- * direct-mapped Xenheap region can be avoided.
- */
- directmap_mfn_start = _mfn((e >> PAGE_SHIFT) - xenheap_pages);
- directmap_mfn_end = mfn_add(directmap_mfn_start, xenheap_pages);
-
- populate_boot_allocator();
-
- setup_directmap_mappings(mfn_x(directmap_mfn_start), xenheap_pages);
-
- /* Frame table covers all of RAM region, including holes */
- setup_frametable_mappings(ram_start, ram_end);
- max_page = PFN_DOWN(ram_end);
-
- /*
- * The allocators may need to use map_domain_page() (such as for
- * scrubbing pages). So we need to prepare the domheap area first.
- */
- if ( !init_domheap_mappings(smp_processor_id()) )
- panic("CPU%u: Unable to prepare the domheap page-tables\n",
- smp_processor_id());
-
- /* Add xenheap memory that was not already added to the boot allocator. */
- init_xenheap_pages(mfn_to_maddr(directmap_mfn_start),
- mfn_to_maddr(directmap_mfn_end));
-
- init_staticmem_pages();
-}
-#else /* CONFIG_ARM_64 */
-static void __init setup_mm(void)
-{
- const struct meminfo *banks = &bootinfo.mem;
- paddr_t ram_start = INVALID_PADDR;
- paddr_t ram_end = 0;
- paddr_t ram_size = 0;
- unsigned int i;
-
- init_pdx();
-
- /*
- * We need some memory to allocate the page-tables used for the directmap
- * mappings. But some regions may contain memory already allocated
- * for other uses (e.g. modules, reserved-memory...).
- *
- * For simplicity, add all the free regions in the boot allocator.
- */
- populate_boot_allocator();
-
- total_pages = 0;
-
- for ( i = 0; i < banks->nr_banks; i++ )
- {
- const struct membank *bank = &banks->bank[i];
- paddr_t bank_end = bank->start + bank->size;
-
- ram_size = ram_size + bank->size;
- ram_start = min(ram_start, bank->start);
- ram_end = max(ram_end, bank_end);
-
- setup_directmap_mappings(PFN_DOWN(bank->start),
- PFN_DOWN(bank->size));
- }
-
- total_pages += ram_size >> PAGE_SHIFT;
-
- directmap_virt_end = XENHEAP_VIRT_START + ram_end - ram_start;
- directmap_mfn_start = maddr_to_mfn(ram_start);
- directmap_mfn_end = maddr_to_mfn(ram_end);
-
- setup_frametable_mappings(ram_start, ram_end);
- max_page = PFN_DOWN(ram_end);
-
- init_staticmem_pages();
-}
-#endif
-
static bool __init is_dom0less_mode(void)
{
struct bootmodules *mods = &bootinfo.modules;
--
2.25.1
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