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lx_emul: implement __get_random_u32_below

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The implementation was already part of the Zynq's sd_card driver and
since other ARM drivers need it as well, promote it to the common
shadow library.

Issue genodelabs/genode-allwinner#21.
This commit is contained in:
Josef Söntgen 2023-05-31 16:26:03 +02:00 committed by Norman Feske
parent 7109b80bbd
commit c888fcbdd9
6 changed files with 27 additions and 52 deletions
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12
repos/dde_linux/src/app/wireguard/lx_emul.c
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@ -39,18 +39,6 @@ int wait_for_random_bytes(void)
#include <linux/prandom.h>
u32 prandom_u32(void)
{
return lx_emul_random_gen_u32();
}
u32 __get_random_u32_below(u32 ceil)
{
return lx_emul_random_gen_u32();
}
u8 get_random_u8(void)
{
u8 ret;

27
repos/dde_linux/src/lib/lx_emul/shadow/drivers/char/random.c
View File

@ -60,3 +60,30 @@ bool rng_is_initialized(void)
{
return 1;
}
u32 __get_random_u32_below(u32 ceil)
{
/**
* Returns a random number from the half-open interval [0, ceil)
* with uniform distribution.
*
* The idea here is to split [0, 2^32) into #ceil bins. By dividing a random
* number from the 32-bit interval, we can determine into which bin the number
* fell.
*/
/* determine divisor to determine bin number by dividing 2^32 by ceil */
u32 div = 0x100000000ULL / ceil;
/**
* In case the above division has a remainder, we will end up with an
* additional (but smaller) bin at the end of the 32-bit interval. We'll
* discard the result if the number fell into this bin and repeat.
*/
u32 result = ceil;
while (result >= ceil)
result = lx_emul_random_gen_u32() / div;
return result;
}

8
repos/dde_linux/src/test/driver_time/dummies.c
View File

@ -22,14 +22,6 @@ void register_syscore_ops(struct syscore_ops * ops)
}
#include <linux/random.h>
u32 __get_random_u32_below(u32 ceil)
{
lx_emul_trace_and_stop(__func__);
}
#include <linux/interrupt.h>
DEFINE_STATIC_KEY_FALSE(force_irqthreads_key);

8
repos/pc/src/drivers/framebuffer/intel/pc/dummies.c
View File

@ -422,14 +422,6 @@ void pci_disable_msi(struct pci_dev *dev)
}
#include <linux/random.h>
u32 __get_random_u32_below(u32 ceil)
{
lx_emul_trace_and_stop(__func__);
}
#include <asm/smp.h>
DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);

16
repos/pc/src/drivers/usb_host/pc/dummies.c
View File

@ -85,14 +85,6 @@ int __printk_ratelimit(const char * func)
}
#include <linux/prandom.h>
u32 prandom_u32(void)
{
lx_emul_trace_and_stop(__func__);
}
#include <linux/pci.h>
void pci_disable_device(struct pci_dev * dev)
@ -101,14 +93,6 @@ void pci_disable_device(struct pci_dev * dev)
}
#include <linux/random.h>
u32 __get_random_u32_below(u32 ceil)
{
lx_emul_trace_and_stop(__func__);
}
#include <asm/smp.h>
DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);

8
repos/pc/src/lib/pc_wifi/dummies.c
View File

@ -386,14 +386,6 @@ void ieee80211_free_led_names(struct ieee80211_local * local)
pteval_t __default_kernel_pte_mask __read_mostly = ~0;
#include <linux/random.h>
u32 __get_random_u32_below(u32 ceil)
{
lx_emul_trace_and_stop(__func__);
}
u16 get_random_u16(void)
{
lx_emul_trace_and_stop(__func__);