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Wed, 07 Oct 2026 10:41:46 -0700 (PDT) From: Magnus Lindholm To: davem@davemloft.net, andreas@gaisler.com Cc: sam@ravnborg.org, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linmag7@gmail.com Subject: [PATCH v5 5/6] sparc32: move early memory setup to setup_arch Date: Wed, 7 Oct 2026 19:41:14 +0200 Message-ID: <20261007174128.959307-6-linmag7@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261007174128.959307-1-linmag7@gmail.com> References: <20261007174128.959307-1-linmag7@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Move the early memory configuration out of SRMMU paging setup and next to the rest of setup_arch(). Derive the PFN limits from memblock, reserve the kernel and initrd there, and retain mem= support with memblock_enforce_memory_limit(). Use for_each_mem_pfn_range() to find the lowmem boundary and set the standard max_pfn variable to the end of physical memory. Use max_pfn as the highmem zone limit and replace last_valid_pfn with max_pfn in LEON's _pfn_valid() check, preserving its existing bounds, including highmem. The removed bootmem code also printed a private HIGHMEM summary. Generic memory initialization already reports the highmem zone, so do not retain the duplicate message. When PAGE_OFFSET maps a relocated kernel, remove memory below phys_base from memblock because it cannot be reached through the linear map. This replaces the equivalent trimming of sp_banks. Suggested-by: Sam Ravnborg Reviewed-by: Sam Ravnborg Signed-off-by: Magnus Lindholm --- arch/sparc/include/asm/highmem.h | 3 - arch/sparc/include/asm/leon.h | 2 +- arch/sparc/include/asm/pgtable_32.h | 3 +- arch/sparc/include/asm/pgtsrmmu.h | 1 - arch/sparc/kernel/setup_32.c | 117 +++++++++++++----------- arch/sparc/mm/init_32.c | 132 +--------------------------- arch/sparc/mm/leon_mm.c | 1 + arch/sparc/mm/srmmu.c | 8 +- 8 files changed, 72 insertions(+), 195 deletions(-) diff --git a/arch/sparc/include/asm/highmem.h b/arch/sparc/include/asm/highmem.h index c7b2e208328b..b1b915ac604d 100644 --- a/arch/sparc/include/asm/highmem.h +++ b/arch/sparc/include/asm/highmem.h @@ -26,9 +26,6 @@ #include #include -/* declarations for highmem.c */ -extern unsigned long highstart_pfn, highend_pfn; - #define kmap_prot __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE) extern pte_t *pkmap_page_table; diff --git a/arch/sparc/include/asm/leon.h b/arch/sparc/include/asm/leon.h index 053a24b67aed..2a1bdc2c2f1d 100644 --- a/arch/sparc/include/asm/leon.h +++ b/arch/sparc/include/asm/leon.h @@ -251,7 +251,7 @@ extern int leon_ipi_irq; /* macros used in leon_mm.c */ #define PFN(x) ((x) >> PAGE_SHIFT) -#define _pfn_valid(pfn) ((pfn < last_valid_pfn) && (pfn >= PFN(phys_base))) +#define _pfn_valid(pfn) ((pfn < max_pfn) && (pfn >= PFN(phys_base))) #define _SRMMU_PTE_PMASK_LEON 0xffffffff /* diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h index f89b1250661d..91a6032cf6a2 100644 --- a/arch/sparc/include/asm/pgtable_32.h +++ b/arch/sparc/include/asm/pgtable_32.h @@ -37,8 +37,7 @@ struct vm_area_struct; struct page; void load_mmu(void); -unsigned long calc_highpages(void); -unsigned long __init bootmem_init(unsigned long *pages_avail); +void __init find_ramdisk(unsigned long end_of_phys_memory); #define pte_ERROR(e) __builtin_trap() #define pmd_ERROR(e) __builtin_trap() diff --git a/arch/sparc/include/asm/pgtsrmmu.h b/arch/sparc/include/asm/pgtsrmmu.h index a265822a475e..a2a6c8564c3e 100644 --- a/arch/sparc/include/asm/pgtsrmmu.h +++ b/arch/sparc/include/asm/pgtsrmmu.h @@ -98,7 +98,6 @@ restore %g0, %g0, %g0; #ifndef __ASSEMBLER__ -extern unsigned long last_valid_pfn; /* This makes sense. Honest it does - Anton */ /* XXX Yes but it's ugly as sin. FIXME. -KMW */ diff --git a/arch/sparc/kernel/setup_32.c b/arch/sparc/kernel/setup_32.c index 6d7d6fb5c49d..246533fba60d 100644 --- a/arch/sparc/kernel/setup_32.c +++ b/arch/sparc/kernel/setup_32.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include #include @@ -254,28 +255,76 @@ static __init void leon_patch(void) struct tt_entry *sparc_ttable; -/* Drop RAM below the kernel; the linear map runs upward from phys_base - * and cannot reach it. - */ -static void __init trim_sp_banks_below(unsigned long base) +unsigned long phys_base; +EXPORT_SYMBOL(phys_base); + +unsigned long pfn_base; +EXPORT_SYMBOL(pfn_base); + +static unsigned long __init calc_max_low_pfn(void) { - int i, j = 0; + unsigned long limit = pfn_base + PHYS_PFN(SRMMU_MAXMEM); + unsigned long start_pfn, end_pfn; + unsigned long last_pfn = 0; + int i; - for (i = 0; sp_banks[i].num_bytes != 0; i++) { - unsigned long start = sp_banks[i].base_addr; - unsigned long end = start + sp_banks[i].num_bytes; + for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) { + if (start_pfn >= limit) { + if (last_pfn < limit) + limit = last_pfn; + break; + } - if (end <= base) - continue; /* wholly below - drop it */ - if (start < base) - start = base; /* straddles - trim the front */ + last_pfn = end_pfn; + } - sp_banks[j].base_addr = start; - sp_banks[j].num_bytes = end - start; - j++; + return limit; +} + +static void __init setup_memory(void) +{ + unsigned long ram_base = memblock_start_of_DRAM(); + unsigned long size; + + memblock_set_bottom_up(true); + memblock_allow_resize(); + + phys_base = ram_base; + /* phys_base must describe what PAGE_OFFSET maps to, not where RAM starts. */ + if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d) { + unsigned long real_base = __get_phys(PAGE_OFFSET); + + prom_printf("phys_base: RAM starts at 0x%lx, kernel is at 0x%lx\n", + phys_base, real_base); + + if (real_base && real_base != phys_base) { + phys_base = real_base; + memblock_remove(0, phys_base); + prom_printf("phys_base: adopted 0x%lx, RAM below it dropped\n", + phys_base); + } } - sp_banks[j].base_addr = 0; - sp_banks[j].num_bytes = 0; + + if (cmdline_memory_size) + memblock_enforce_memory_limit(cmdline_memory_size); + + min_low_pfn = PFN_DOWN(memblock_start_of_DRAM()); + pfn_base = PHYS_PFN(phys_base); + max_pfn = PFN_DOWN(memblock_end_of_DRAM()); + max_low_pfn = max_pfn; + + if (max_low_pfn > pfn_base + PHYS_PFN(SRMMU_MAXMEM)) + max_low_pfn = calc_max_low_pfn(); + + find_ramdisk(memblock_end_of_DRAM()); + + /* Reserve the kernel text/data/bss. */ + size = __pa(PAGE_ALIGN((unsigned long)&_end)) - phys_base; + memblock_reserve(phys_base, size); + memblock_add(phys_base, size); + + /* Only allow low memory to be allocated by memblock. */ + memblock_set_current_limit(PFN_PHYS(max_low_pfn)); } /* Called from head_32.S - before we have setup anything @@ -306,9 +355,6 @@ void __init sparc32_start_kernel(struct linux_romvec *rp) void __init setup_arch(char **cmdline_p) { - int i; - unsigned long highest_paddr; - sparc_ttable = &trapbase[0]; /* Initialize PROM console and command line. */ @@ -343,36 +389,7 @@ void __init setup_arch(char **cmdline_p) idprom_init(); load_mmu(); - - phys_base = 0xffffffffUL; - highest_paddr = 0UL; - for (i = 0; sp_banks[i].num_bytes != 0; i++) { - unsigned long top; - - if (sp_banks[i].base_addr < phys_base) - phys_base = sp_banks[i].base_addr; - top = sp_banks[i].base_addr + - sp_banks[i].num_bytes; - if (highest_paddr < top) - highest_paddr = top; - } - - /* phys_base must describe what PAGE_OFFSET maps to, not where RAM starts. */ - if (sparc_cpu_model == sun4m || sparc_cpu_model == sun4d) { - unsigned long real_base = __get_phys(PAGE_OFFSET); - - prom_printf("phys_base: RAM starts at 0x%lx, kernel is at 0x%lx\n", - phys_base, real_base); - - if (real_base && real_base != phys_base) { - phys_base = real_base; - trim_sp_banks_below(phys_base); - prom_printf("phys_base: adopted 0x%lx, RAM below it dropped\n", - phys_base); - } - } - - pfn_base = phys_base >> PAGE_SHIFT; + setup_memory(); if (!root_flags) root_mountflags &= ~MS_RDONLY; diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c index 6880d9cb30a5..ac4462f1cf76 100644 --- a/arch/sparc/mm/init_32.c +++ b/arch/sparc/mm/init_32.c @@ -35,66 +35,13 @@ #include "mm_32.h" -unsigned long phys_base; -EXPORT_SYMBOL(phys_base); - -unsigned long pfn_base; -EXPORT_SYMBOL(pfn_base); - struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; /* Initial ramdisk setup */ extern unsigned int sparc_ramdisk_image; extern unsigned int sparc_ramdisk_size; -unsigned long highstart_pfn, highend_pfn; - -unsigned long last_valid_pfn; - -unsigned long calc_highpages(void) -{ - int i; - int nr = 0; - - for (i = 0; sp_banks[i].num_bytes != 0; i++) { - unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; - unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; - - if (end_pfn <= max_low_pfn) - continue; - - if (start_pfn < max_low_pfn) - start_pfn = max_low_pfn; - - nr += end_pfn - start_pfn; - } - - return nr; -} - -static unsigned long calc_max_low_pfn(void) -{ - int i; - unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); - unsigned long curr_pfn, last_pfn; - - last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT; - for (i = 1; sp_banks[i].num_bytes != 0; i++) { - curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; - - if (curr_pfn >= tmp) { - if (last_pfn < tmp) - tmp = last_pfn; - break; - } - - last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; - } - - return tmp; -} - -static void __init find_ramdisk(unsigned long end_of_phys_memory) +void __init find_ramdisk(unsigned long end_of_phys_memory) { #ifdef CONFIG_BLK_DEV_INITRD unsigned long size; @@ -124,83 +71,6 @@ static void __init find_ramdisk(unsigned long end_of_phys_memory) #endif } -unsigned long __init bootmem_init(unsigned long *pages_avail) -{ - unsigned long start_pfn, bytes_avail, size; - unsigned long end_of_phys_memory = 0; - unsigned long high_pages = 0; - int i; - - memblock_set_bottom_up(true); - memblock_allow_resize(); - - bytes_avail = 0UL; - for (i = 0; sp_banks[i].num_bytes != 0; i++) { - end_of_phys_memory = sp_banks[i].base_addr + - sp_banks[i].num_bytes; - bytes_avail += sp_banks[i].num_bytes; - if (cmdline_memory_size) { - if (bytes_avail > cmdline_memory_size) { - unsigned long slack = bytes_avail - cmdline_memory_size; - - bytes_avail -= slack; - end_of_phys_memory -= slack; - - sp_banks[i].num_bytes -= slack; - if (sp_banks[i].num_bytes == 0) { - sp_banks[i].base_addr = 0xdeadbeef; - } else { - memblock_add(sp_banks[i].base_addr, - sp_banks[i].num_bytes); - sp_banks[i+1].num_bytes = 0; - sp_banks[i+1].base_addr = 0xdeadbeef; - } - break; - } - } - memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes); - } - - if (cmdline_memory_size) - memblock_enforce_memory_limit(cmdline_memory_size); - - /* Start with page aligned address of last symbol in kernel - * image. - */ - start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end)); - - /* Now shift down to get the real physical page frame number. */ - start_pfn >>= PAGE_SHIFT; - - max_pfn = end_of_phys_memory >> PAGE_SHIFT; - - max_low_pfn = max_pfn; - highstart_pfn = highend_pfn = max_pfn; - - if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) { - highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); - max_low_pfn = calc_max_low_pfn(); - high_pages = calc_highpages(); - printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", - high_pages >> (20 - PAGE_SHIFT)); - } - - find_ramdisk(end_of_phys_memory); - - /* Reserve the kernel text/data/bss. */ - size = (start_pfn << PAGE_SHIFT) - phys_base; - memblock_reserve(phys_base, size); - memblock_add(phys_base, size); - - size = memblock_phys_mem_size() - memblock_reserved_size(); - *pages_avail = (size >> PAGE_SHIFT) - high_pages; - - /* Only allow low memory to be allocated via memblock allocation */ - memblock_set_current_limit(max_low_pfn << PAGE_SHIFT); - - return max_pfn; -} - /* * paging_init() sets up the page tables: We call the MMU specific * init routine based upon the Sun model type on the Sparc. diff --git a/arch/sparc/mm/leon_mm.c b/arch/sparc/mm/leon_mm.c index 1dc9b3d70eda..a43c5ffbbbe5 100644 --- a/arch/sparc/mm/leon_mm.c +++ b/arch/sparc/mm/leon_mm.c @@ -11,6 +11,7 @@ */ #include +#include #include #include #include diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c index 7b57a10c961f..444295c20b94 100644 --- a/arch/sparc/mm/srmmu.c +++ b/arch/sparc/mm/srmmu.c @@ -59,8 +59,6 @@ int vac_line_size; extern struct resource sparc_iomap; -extern unsigned long last_valid_pfn; - static pgd_t *srmmu_swapper_pg_dir; const struct sparc32_cachetlb_ops *sparc32_cachetlb_ops; @@ -842,7 +840,7 @@ void __init arch_zone_limits_init(unsigned long *max_zone_pfns) { max_zone_pfns[ZONE_DMA] = max_low_pfn; max_zone_pfns[ZONE_NORMAL] = max_low_pfn; - max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; + max_zone_pfns[ZONE_HIGHMEM] = max_pfn; } void __init srmmu_paging_init(void) @@ -855,7 +853,6 @@ void __init srmmu_paging_init(void) pud_t *pud; pmd_t *pmd; pte_t *pte; - unsigned long pages_avail; init_mm.context = (unsigned long) NO_CONTEXT; sparc_iomap.start = SUN4M_IOBASE_VADDR; /* 16MB of IOSPACE on all sun4m's. */ @@ -881,9 +878,6 @@ void __init srmmu_paging_init(void) prom_halt(); } - pages_avail = 0; - last_valid_pfn = bootmem_init(&pages_avail); - srmmu_nocache_calcsize(); srmmu_nocache_init(); srmmu_inherit_prom_mappings(0xfe400000, (LINUX_OPPROM_ENDVM - PAGE_SIZE)); -- 2.43.0