lx_emul: move arm_64 specifics, add x86 specifics

Split in between x86 and arm code. Move arm-specifics away from
generic include pathes.

Ref genodelabs/genode#4411

repos/dde_linux/src/include/lx_emul/init.h

@@ -24,6 +24,8 @@ void lx_emul_register_initcall(int (*initcall)(void), const char * name);
 
 void lx_emul_start_kernel(void * dtb);
 
+void lx_emul_setup_arch(void * dtb);
+
 int  lx_emul_init_task_function(void * dtb);
 
 extern void * lx_emul_init_task_struct;

repos/dde_linux/src/include/lx_emul/shadow/linux/pgtable.h

@@ -23,7 +23,25 @@ int    pmd_swp_soft_dirty(pmd_t pmd);
 
 void __init pgtable_cache_init(void);
 
+#ifndef pgprot_decrypted
 #define pgprot_decrypted(prot) (prot)
+#endif
+
+#ifndef mm_pud_folded
+#define mm_pud_folded(mm)	__is_defined(__PAGETABLE_PUD_FOLDED)
+#endif
+
+#ifndef mm_pmd_folded
+#define mm_pmd_folded(mm)	__is_defined(__PAGETABLE_PMD_FOLDED)
+#endif
+
+#ifndef pud_offset
+static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
+{
+	return 0;
+}
+#define pud_offset pud_offset
+#endif
 
 pte_t pte_swp_clear_uffd_wp(pte_t pte);
 pte_t pte_swp_clear_soft_dirty(pte_t pte);

repos/dde_linux/src/include/lx_kit/env.h

@@ -15,7 +15,6 @@
 #define _LX_KIT__ENV_H_
 
 #include <base/env.h>
-#include <platform_session/connection.h>
 #include <timer_session/connection.h>
 #include <lx_kit/console.h>
 #include <lx_kit/device.h>

repos/dde_linux/src/include/lx_kit/memory.h

@@ -15,6 +15,7 @@
 #define _LX_KIT__MEMORY_H_
 
 #include <base/allocator_avl.h>
+#include <base/attached_dataspace.h>
 #include <base/cache.h>
 #include <base/env.h>
 #include <base/heap.h>

repos/dde_linux/src/lib/lx_emul/shadow/kernel/dma/mapping.c

@@ -24,10 +24,12 @@ void * dma_alloc_attrs(struct device * dev,
 {
 	void * addr;
 
+#ifdef CONFIG_ARM
 	if (dev && dev->dma_mem) {
 		printk("We do not support device DMA memory yet!\n");
 		lx_emul_trace_and_stop(__func__);
 	}
+#endif
 
 	addr = lx_emul_mem_alloc_aligned_uncached(size, PAGE_SIZE);
 	*dma_handle = lx_emul_mem_dma_addr(addr);

repos/dde_linux/src/lib/lx_emul/shadow/kernel/fork.c

@@ -58,7 +58,9 @@ pid_t kernel_thread(int (* fn)(void *),void * arg,unsigned long flags)
 		.signal = {{0}}
 	}};
 
+#ifndef CONFIG_X86
 	task->thread_info.preempt_count = 0;
+#endif
 
 	lx_emul_task_create(task, "kthread", task->pid, fn, arg);
 	return task->pid;

repos/dde_linux/src/lib/lx_emul/spec/arm/start.c

@@ -0,0 +1,38 @@
+/*
+ * \brief  Linux Kernel initialization
+ * \author Stefan Kalkowski
+ * \date   2021-03-16
+ */
+
+/*
+ * Copyright (C) 2021 Genode Labs GmbH
+ *
+ * This file is distributed under the terms of the GNU General Public License
+ * version 2.
+ */
+
+#include <lx_emul/init.h>
+#include <lx_emul/time.h>
+
+#include <linux/clockchips.h>
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_clk.h>
+#include <linux/of_fdt.h>
+
+
+void time_init(void)
+{
+	/* arch/arm64/kernel/time.c */
+	lx_emul_time_init(); /* replaces timer_probe() */
+	tick_setup_hrtimer_broadcast();
+	lpj_fine = 1000000 / HZ;
+}
+
+
+void lx_emul_setup_arch(void *dtb)
+{
+	/* calls from setup_arch of arch/arm64/kernel/setup.c */
+	early_init_dt_scan(dtb);
+	unflatten_device_tree();
+}

repos/dde_linux/src/lib/lx_emul/spec/x86/start.c

@@ -0,0 +1,33 @@
+/*
+ * \brief  Linux Kernel initialization
+ * \author Stefan Kalkowski
+ * \date   2022-01-08
+ */
+
+/*
+ * Copyright (C) 2021 Genode Labs GmbH
+ *
+ * This file is distributed under the terms of the GNU General Public License
+ * version 2.
+ */
+
+#include <lx_emul/init.h>
+#include <lx_emul/time.h>
+
+#include <linux/delay.h>
+#include <linux/sched/clock.h>
+
+unsigned long long sched_clock(void)
+{
+	return lx_emul_time_counter() * 1000;
+}
+
+
+void time_init(void)
+{
+	lx_emul_time_init(); /* replaces timer_probe() */
+	lpj_fine = 1000000 / HZ;
+}
+
+
+void lx_emul_setup_arch(void *dtb) { }

repos/dde_linux/src/lib/lx_emul/start.c

@@ -36,6 +36,9 @@ extern int buses_init(void);
 extern int classes_init(void);
 extern int platform_bus_init(void);
 
+/* definition from kernel/main.c implemented architecture specific */
+extern void time_init(void);
+
 enum system_states system_state;
 
 static __initdata DECLARE_COMPLETION(kthreadd_done);
@@ -92,9 +95,7 @@ int lx_emul_init_task_function(void * dtb)
 	 * Here we do the minimum normally done start_kernel() of init/main.c
 	 */
 
-	/* calls from setup_arch of arch/arm64/kernel/setup.c */
-	early_init_dt_scan(dtb);
-	unflatten_device_tree();
+	lx_emul_setup_arch(dtb);
 
 	jump_label_init();
 	kmem_cache_init();
@@ -110,11 +111,7 @@ int lx_emul_init_task_function(void * dtb)
 	softirq_init();
 	timekeeping_init();
 
-	/* arch/arm64/kernel/time.c */
-	lx_emul_time_init(); /* replaces timer_probe() */
-	tick_setup_hrtimer_broadcast();
-	lpj_fine = 1000000 / HZ;
-	/* arch/arm64/kernel/time.c end */
+	time_init();
 
 	sched_clock_init();