[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH ARM v6 08/14] mini-os: arm: memory management
Based on an initial patch by Karim Raslan. Signed-off-by: Karim Allah Ahmed <karim.allah.ahmed@xxxxxxxxx> Signed-off-by: Thomas Leonard <talex5@xxxxxxxxx> --- Changes since v5: - Require only minimum property lengths (requested by Ian Campbell). Addressed Julien Grall's comments: - Added comments explaining the lengths when checking FDT properties. - Use paddr_t type to represent physical addresses. --- extras/mini-os/arch/arm/mm.c | 138 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 138 insertions(+) create mode 100644 extras/mini-os/arch/arm/mm.c diff --git a/extras/mini-os/arch/arm/mm.c b/extras/mini-os/arch/arm/mm.c new file mode 100644 index 0000000..ec1f821 --- /dev/null +++ b/extras/mini-os/arch/arm/mm.c @@ -0,0 +1,138 @@ +#include <mini-os/console.h> +#include <xen/memory.h> +#include <arch_mm.h> +#include <mini-os/hypervisor.h> +#include <libfdt.h> +#include <lib.h> + +int physical_address_offset; + +unsigned long allocate_ondemand(unsigned long n, unsigned long alignment) +{ + // FIXME + BUG(); +} + +void arch_init_mm(unsigned long *start_pfn_p, unsigned long *max_pfn_p) +{ + int memory; + int prop_len = 0; + const uint64_t *regs; + + printk(" _text: %p(VA)\n", &_text); + printk(" _etext: %p(VA)\n", &_etext); + printk(" _erodata: %p(VA)\n", &_erodata); + printk(" _edata: %p(VA)\n", &_edata); + printk(" stack start: %p(VA)\n", _boot_stack); + printk(" _end: %p(VA)\n", &_end); + + if (fdt_num_mem_rsv(device_tree) != 0) + printk("WARNING: reserved memory not supported!\n"); + + memory = fdt_node_offset_by_prop_value(device_tree, -1, "device_type", "memory", sizeof("memory")); + if (memory < 0) { + printk("No memory found in FDT!\n"); + BUG(); + } + + /* Xen will always provide us at least one bank of memory. + * Mini-OS will use the first bank for the time-being. */ + regs = fdt_getprop(device_tree, memory, "reg", &prop_len); + + /* The property must contain at least the start address + * and size, each of which is 8-bytes. */ + if (regs == NULL || prop_len < 16) { + printk("Bad 'reg' property: %p %d\n", regs, prop_len); + BUG(); + } + + unsigned int end = (unsigned int) &_end; + paddr_t mem_base = fdt64_to_cpu(regs[0]); + unsigned int mem_size = fdt64_to_cpu(regs[1]); + printk("Found memory at %p (len 0x%x)\n", mem_base, mem_size); + + BUG_ON(to_virt(mem_base) > (void *) &_text); /* Our image isn't in our RAM! */ + *start_pfn_p = PFN_UP(to_phys(end)); + int heap_len = mem_size - (PFN_PHYS(*start_pfn_p) - mem_base); + *max_pfn_p = *start_pfn_p + PFN_DOWN(heap_len); + + printk("Using pages %d to %d as free space for heap.\n", *start_pfn_p, *max_pfn_p); + + /* The device tree is probably in memory that we're about to hand over to the page + * allocator, so move it to the end and reserve that space. + */ + int fdt_size = fdt_totalsize(device_tree); + void *new_device_tree = to_virt(((*max_pfn_p << PAGE_SHIFT) - fdt_size) & PAGE_MASK); + if (new_device_tree != device_tree) { + memmove(new_device_tree, device_tree, fdt_size); + } + device_tree = new_device_tree; + *max_pfn_p = to_phys(new_device_tree) >> PAGE_SHIFT; +} + +void arch_init_p2m(unsigned long max_pfn) +{ +} + +void arch_init_demand_mapping_area(unsigned long cur_pfn) +{ +} + +/* Get Xen's suggested physical page assignments for the grant table. */ +static paddr_t get_gnttab_base(void) +{ + int hypervisor; + int len = 0; + const uint64_t *regs; + paddr_t gnttab_base; + + hypervisor = fdt_node_offset_by_compatible(device_tree, -1, "xen,xen"); + BUG_ON(hypervisor < 0); + + regs = fdt_getprop(device_tree, hypervisor, "reg", &len); + /* The property contains the address and size, 8-bytes each. */ + if (regs == NULL || len < 16) { + printk("Bad 'reg' property: %p %d\n", regs, len); + BUG(); + } + + gnttab_base = fdt64_to_cpu(regs[0]); + + printk("FDT suggests grant table base %lx\n", gnttab_base); + + return gnttab_base; +} + +grant_entry_t *arch_init_gnttab(int nr_grant_frames) +{ + struct xen_add_to_physmap xatp; + struct gnttab_setup_table setup; + xen_pfn_t frames[nr_grant_frames]; + paddr_t gnttab_table; + int i, rc; + + gnttab_table = get_gnttab_base(); + + for (i = 0; i < nr_grant_frames; i++) + { + xatp.domid = DOMID_SELF; + xatp.size = 0; /* Seems to be unused */ + xatp.space = XENMAPSPACE_grant_table; + xatp.idx = i; + xatp.gpfn = (gnttab_table >> PAGE_SHIFT) + i; + rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp); + BUG_ON(rc != 0); + } + + setup.dom = DOMID_SELF; + setup.nr_frames = nr_grant_frames; + set_xen_guest_handle(setup.frame_list, frames); + HYPERVISOR_grant_table_op(GNTTABOP_setup_table, &setup, 1); + if (setup.status != 0) + { + printk("GNTTABOP_setup_table failed; status = %d\n", setup.status); + BUG(); + } + + return to_virt(gnttab_table); +} -- 2.0.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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