static void __init find_limits(unsigned long *min, unsigned long *max_low,
unsigned long *max_high)
{
*max_low = PFN_DOWN(memblock_get_current_limit());
*min = PFN_UP(memblock_start_of_DRAM());
*max_high = PFN_DOWN(memblock_end_of_DRAM());
}
void __init bootmem_init(void)
{
/* Reserve all memory below PHYS_OFFSET, as memory
* accounting doesn't work for pages below that address.
*
* If PHYS_OFFSET is zero reserve page at address 0:
* successfull allocations should never return NULL.
*/
if (PHYS_OFFSET)
memblock_reserve(0, PHYS_OFFSET);
else
memblock_reserve(0, 1);
early_init_fdt_scan_reserved_mem();
if (!memblock_phys_mem_size())
panic("No memory found!\n");
min_low_pfn = PFN_UP(memblock_start_of_DRAM());
min_low_pfn = max(min_low_pfn, PFN_UP(PHYS_OFFSET));
max_pfn = PFN_DOWN(memblock_end_of_DRAM());
max_low_pfn = min(max_pfn, MAX_LOW_PFN);
memblock_set_current_limit(PFN_PHYS(max_low_pfn));
dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
memblock_dump_all();
}
static long long __init keystone_pv_fixup(void)
{
long long offset;
phys_addr_t mem_start, mem_end;
mem_start = memblock_start_of_DRAM();
mem_end = memblock_end_of_DRAM();
/* nothing to do if we are running out of the <32-bit space */
if (mem_start >= KEYSTONE_LOW_PHYS_START &&
mem_end <= KEYSTONE_LOW_PHYS_END)
return 0;
if (mem_start < KEYSTONE_HIGH_PHYS_START ||
mem_end > KEYSTONE_HIGH_PHYS_END) {
pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
(u64)mem_start, (u64)mem_end);
return 0;
}
offset = KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START;
/* Populate the arch idmap hook */
arch_phys_to_idmap_offset = -offset;
return offset;
}
static void __init keystone_init_meminfo(void)
{
bool lpae = IS_ENABLED(CONFIG_ARM_LPAE);
bool pvpatch = IS_ENABLED(CONFIG_ARM_PATCH_PHYS_VIRT);
phys_addr_t offset = PHYS_OFFSET - KEYSTONE_LOW_PHYS_START;
phys_addr_t mem_start, mem_end;
mem_start = memblock_start_of_DRAM();
mem_end = memblock_end_of_DRAM();
/* nothing to do if we are running out of the <32-bit space */
if (mem_start >= KEYSTONE_LOW_PHYS_START &&
mem_end <= KEYSTONE_LOW_PHYS_END)
return;
if (!lpae || !pvpatch) {
pr_crit("Enable %s%s%s to run outside 32-bit space\n",
!lpae ? __stringify(CONFIG_ARM_LPAE) : "",
(!lpae && !pvpatch) ? " and " : "",
!pvpatch ? __stringify(CONFIG_ARM_PATCH_PHYS_VIRT) : "");
}
if (mem_start < KEYSTONE_HIGH_PHYS_START ||
mem_end > KEYSTONE_HIGH_PHYS_END) {
pr_crit("Invalid address space for memory (%08llx-%08llx)\n",
(u64)mem_start, (u64)mem_end);
}
offset += KEYSTONE_HIGH_PHYS_START;
__pv_phys_pfn_offset = PFN_DOWN(offset);
__pv_offset = (offset - PAGE_OFFSET);
/* Populate the arch idmap hook */
arch_virt_to_idmap = keystone_virt_to_idmap;
platform_nb.notifier_call = keystone_platform_notifier;
keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START -
KEYSTONE_LOW_PHYS_START);
pr_info("Switching to high address space at 0x%llx\n", (u64)offset);
}
/*
* Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
* currently assumes that for memory starting above 4G, 32-bit devices will
* use a DMA offset.
*/
static phys_addr_t max_zone_dma_phys(void)
{
phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
return min(offset + (1ULL << 32), memblock_end_of_DRAM());
}